Investments

Bharat Bond ETFs and Target-Maturity Debt Funds for NRIs: The Predictable Yield, and the Tax That Eats Into It

Bharat Bond ETFs lock a predictable yield in AAA PSU bonds, but Section 50AA now taxes NRI gains at slab. The post-2023 maths, TDS, and the NRE FD it loses to.

, NRI Finance WriterReviewed 25 March 202623 min read

Your relationship manager in India sends you a one-line pitch: a Bharat Bond ETF maturing in April 2033, government-backed PSU bonds, yield to maturity around 7.3%, expense ratio almost nothing, "and tax-efficient if you hold it past three years." Three of those four claims are true. The fourth was true until April 1, 2023, and it is the one that determines whether this instrument actually beats the NRE fixed deposit sitting next to it on the menu. The tax break that made target-maturity funds the smart money's debt allocation was repealed almost three years ago, and the pitch has not caught up.

The 30-second answer: A Bharat Bond ETF is a passive target-maturity fund that holds AAA-rated CPSE (public sector) bonds to a fixed date (currently April 2030, 2031, 2032, 2033), at an expense ratio near 0.0005% to 0.01%, with a published yield to maturity you broadly lock if you hold to maturity. NRIs invest via an NRI demat (ETF) or as a fund-of-funds, on a repatriable (NRE) or non-repatriable (NRO) basis. Since April 1, 2023, Section 50AA taxes the gain as short-term at your slab rate regardless of holding period, no indexation, with TDS deducted at source. An NRE FD is tax-free in India under Section 10(4)(ii). On equal pre-tax yields, the NRE FD wins on post-tax return for a 30%-bracket NRI; the ETF earns its place on a long locked yield, tradability, and diversification.

This guide is for the NRI weighing a Bharat Bond ETF, or any target-maturity debt fund, against the obvious alternative of an NRE deposit, after the post-2023 rules quietly rewrote the comparison. I will explain what these funds actually are and why their structure is genuinely clever, how an NRI invests (eligibility, demat, NRE versus NRO, the US and Canada blocks), exactly what Section 50AA did to the tax case, how TDS bites at redemption, how the maths stacks up against a tax-free NRE FD and against an ordinary debt fund, where credit and rate risk sit, where these funds still belong in a portfolio, a worked post-tax example on Rs 20,00,000, the edge cases that flip the answer, and the honest read at the end.

What a Bharat Bond ETF actually is

Bharat Bond is a government initiative launched in 2019 to give central public sector enterprises a low-cost route to debt funding and to give retail investors clean exposure to high-quality bonds. The ETFs are managed by Edelweiss Asset Management, and the series is built around fixed maturity dates: as of 2026 the live series mature in April 2030, 2031, 2032 and 2033, with the earlier April 2023 and April 2025 series already matured and returned.

Three features define the structure, and each one matters for an NRI.

It is passive and it is cheap. The ETF does not try to beat a benchmark. It tracks a Bharat Bond index of CPSE bonds, holds them, and that is essentially the whole job. Because there is no active management, the expense ratio is among the lowest of any pooled investment available in India, around 0.0005% to 0.01% a year. On a Rs 20,00,000 holding, that is a cost of roughly Rs 10 to Rs 200 a year, which is effectively a rounding error. Compare that to an actively managed debt fund at 0.3% to 1%, and the cost saving compounds quietly in your favour.

It holds only AAA-rated public sector bonds. The ETFs are mandated to invest in AAA-rated securities of CPSEs and other public sector entities only. These are the bonds of large, government-owned companies, and AAA is the highest domestic credit rating. The credit risk is low, though, as I will stress later, it is not zero and it is not a deposit.

It has a target maturity. This is the clever part. A normal debt fund is open-ended and perpetual, so its return is uncertain because the manager keeps buying and selling bonds. A Bharat Bond ETF, by contrast, holds bonds that mature around the same date as the ETF itself. As that date approaches, the bonds are redeemed by their issuers, the fund winds up, and you are paid out. Because the underlying bonds are held to their own maturity, the fund behaves much more like a long-dated deposit than a perpetual fund. The published yield to maturity (YTM) at the time you buy is, broadly, the return you should expect if you hold to maturity and reinvest coupons at similar rates, ignoring the small expense ratio and any default. That predictability is the entire reason target-maturity funds exist.

A quick word on the fund-of-funds (FoF) version. For each ETF, Edelweiss also runs a matching FoF that simply holds the ETF. The FoF needs no demat account and is bought and sold like any open-ended mutual fund at NAV, which makes it operationally simpler for many investors. The ETF, by contrast, trades on the exchange and needs a demat account, but lets you buy and sell at live prices during market hours. For tax, the two are treated the same way under Section 50AA, so the choice between ETF and FoF is about operational convenience, not tax.

How an NRI invests: eligibility, demat, NRE and NRO

NRIs are permitted to invest in Bharat Bond ETFs and FoFs, subject to the scheme's offer document, and the mechanics follow the standard Indian mutual-fund and demat rules.

The ETF route needs an NRI demat and trading account, because the ETF is bought and sold on the NSE or BSE like a share. If you do not already have one, the setup is covered in the NRI demat account setup guide. You place a buy order on the exchange during market hours; the units settle into your demat. Note that ETF liquidity on the exchange can be thin, so use limit orders and watch the bid-ask spread rather than buying at market in a hurry.

The FoF route needs no demat. You invest like any mutual fund, subject to the standard NRI eligibility rules, directly with the AMC or through a platform, and redeem at NAV.

The NRE versus NRO choice determines repatriation, and it is the single most important operational decision:

  • Repatriable basis (NRE). Apply from a demat or folio linked to your NRE account and fund it from NRE money. The entire proceeds, capital and gain, are freely repatriable with no annual cap. This is the right choice for foreign-earned money you may want to send back out.
  • Non-repatriable basis (NRO). Apply from a demat or folio linked to your NRO account and fund it from NRO money. Proceeds are repatriable only up to USD 1 million per financial year across all your NRO funds, under the standard NRO limit. This is the route for money already sitting in India (rental income, dividends, sale proceeds).

The repatriable-versus-non-repatriable distinction in a demat context, and why it is fixed at the time of investment, is covered in repatriable vs non-repatriable demat holdings. You cannot casually convert one to the other later, so decide up front based on where the money needs to end up.

The US and Canada problem. Many Indian AMCs do not accept investments from NRIs resident in the US and Canada, or accept them only with extra paperwork and physical (not online) transactions, because of the compliance burden under FATCA. This is a recurring obstacle covered in the funds that do not accept US and Canada NRIs. Before you build any plan around a Bharat Bond ETF, confirm the AMC accepts your specific country of residence. And even where it does, US and Canada residents face a separate home-country tax problem with the fund, which I cover in the edge cases.

What Section 50AA did to the tax case

Here is where the old pitch falls apart. For years, the case for a Bharat Bond ETF over an FD rested heavily on tax. Hold a debt-oriented fund for more than 36 months and the gain was long-term, taxed at 20% with indexation. Indexation inflated your purchase cost by the official cost inflation index, which on a multi-year hold could shrink the taxable gain dramatically in real terms. A target-maturity fund held for six or seven years to its maturity date was the textbook use case for this benefit. That is the rule the pitch is still quoting.

The Finance Act 2023 ended it. From April 1, 2023, Section 50AA governs the taxation of "specified mutual funds." The mechanism is a deeming provision: any gain on transfer or redemption of units of a specified mutual fund acquired on or after April 1, 2023 is deemed to be short-term capital gain, regardless of how long you actually held the units. Deemed short-term means the gain is added to your total income and taxed at your applicable slab rate. There is no indexation. There is no long-term rate. A Bharat Bond ETF held for seven years to its 2033 maturity and one held for seven months are taxed identically.

A specified mutual fund under the definition that applied from FY 2025-26 (AY 2026-27) is one that invests more than 65% of its proceeds in debt and money market instruments (the earlier definition keyed off domestic equity being not more than 35%). A Bharat Bond ETF holds essentially 100% AAA PSU bonds, so it sits squarely inside Section 50AA on either definition. There is no ambiguity here: a Bharat Bond ETF gain is taxed at your slab.

For a non-resident in the 30% bracket, this is the difference. Take a Rs 5,00,000 gain on a long-held Bharat Bond position. Under the old route, indexation over six or seven years might have cut the taxable gain to, say, Rs 2,00,000 taxed at 20%, roughly Rs 40,000. Under Section 50AA, the full Rs 5,00,000 is taxed at 30% plus 4% cess, roughly Rs 1,56,000. The repeal nearly quadrupled the tax on the same gain for a high-bracket NRI. The broader debt-fund version of this comparison sits in NRI debt funds vs bank FD after 2023, and the general capital-gains framework for funds is in capital gains tax for NRIs on shares and mutual funds.

One nuance worth keeping: Section 50AA applies to units acquired on or after April 1, 2023. If you somehow hold Bharat Bond units bought before that date (the April 2030 and 2031 series, for instance, were launched before the cutoff), those legacy units are not caught by the automatic short-term deeming and follow the older holding-period logic, with long-term gains now in the 12.5% without indexation regime after the July 23, 2024 overhaul. Check your acquisition dates on the capital gains statement. For any unit bought in the last three years, the benefit is gone.

TDS at source: how the redemption is taxed

The tax bill is not the only thing that changed. When and how the money is taken matters for an NRI, and a fund redemption is taxed at source in a way a deposit is not.

When an NRI redeems a Bharat Bond ETF or FoF, the AMC deducts TDS on the capital gain before paying you. For a gain under Section 50AA, that TDS is typically 30% plus surcharge and cess, because the gain is taxed as ordinary slab income and the AMC applies the top individual rate by default for a non-resident. The mechanics of redemption TDS are covered in NRI mutual fund TDS on redemption.

Two structural points follow. First, the TDS is on the gain, computed by the AMC, and it comes out of your proceeds before the money reaches your account. Second, if your actual liability is lower (you are in a lower slab, or you have other set-offs), you recover the excess only by filing an Indian return and claiming a refund, covered in TDS for NRIs and refunds. That refund can take the better part of a year, during which your money sits with the tax department earning you nothing.

Unlike NRO interest, there is limited scope to reduce the rate via a DTAA for a capital gain on a fund, because capital-gains articles in most treaties either tax the gain in India or are complex to invoke at the TDS stage. The practical reality for most NRIs is that the AMC withholds at 30% plus surcharge and cess on the gain and you sort out the final position when you file. Contrast this with the reduce NRO TDS using the DTAA route, which works on interest, not fund gains.

Compare all of this to an NRE FD, where there is no TDS at all, because the interest is exempt. The deposit compounds and matures clean, with nothing withheld and no refund to chase.

Comparison: Bharat Bond ETF vs NRE FD vs ordinary debt fund

Three instruments, three tax treatments. Lining them up is the clearest way to see where the Bharat Bond ETF actually sits.

NRE fixed deposit. Interest is exempt from Indian income tax under Section 10(4)(ii) for as long as you are a non-resident under FEMA. No TDS, full and free repatriation. As of 2026, NRE FD rates sit around 6.5% to 7.25%, and the rate landscape is in the best banks for NRI FD rates in 2026 and the NRE, NRO and FCNR account overview. The catch: an FD is locked for its tenure, and the longest NRE FD tenures rarely exceed 10 years, with most clustering at 1 to 5 years. You also carry single-issuer (bank) risk beyond the Rs 5,00,000 DICGC cover, and you face reinvestment risk: when a 3-year FD matures, you reinvest at whatever rates prevail then, which may be lower.

Bharat Bond ETF. Gain taxed at slab under Section 50AA, TDS at source. But it offers something the FD cannot: a single, locked yield to a distant maturity (up to 2033), so you fix today's rate for seven-plus years rather than rolling 3-year deposits and facing reinvestment risk each time. It diversifies across many AAA PSU issuers rather than one bank. And it is tradable daily on the exchange if you need to exit before maturity (with price risk, see below).

Ordinary open-ended debt fund. Also taxed at slab under Section 50AA, TDS at source. The difference from the Bharat Bond ETF is structural, not tax: an ordinary debt fund is perpetual with no target maturity, so its return is uncertain and depends on the manager's calls and on rate movements, and it carries no built-in payout date. The Bharat Bond ETF's target-maturity design gives you the predictability the ordinary fund lacks, at the same tax cost.

So on tax, the NRE FD beats both funds decisively for a non-resident, because its interest is tax-free in India while both funds are taxed at slab. On predictability, the Bharat Bond ETF beats the ordinary debt fund (locked YTM to a known date) and arguably beats the FD on horizon (you can lock a yield for far longer than most FDs allow). On safety, the FD edges the funds (deposit, DICGC cover on a slice, no mark-to-market). The Bharat Bond ETF is, in effect, the most FD-like of the funds, but it is still a fund, and the tax follows the fund rules.

Credit risk, rate risk, and the held-to-maturity promise

The predictability of a target-maturity fund holds only if you hold to maturity. Three risks deserve naming.

Interest-rate (duration) risk on early exit. If you sell the ETF on the exchange before maturity, you get the prevailing market price, not the YTM you locked at purchase. Bond prices move inversely to interest rates: if rates have risen since you bought, the ETF's market price will have fallen, and you can take a capital loss on an early exit even though the held-to-maturity yield was positive. The YTM is a promise about the maturity date, not about any date in between. This is the single most misunderstood feature of these funds.

Reinvestment risk on coupons. The published YTM assumes coupons are reinvested at the same yield. If rates fall, the coupons get reinvested at lower rates, and your realised return drifts slightly below the headline YTM. This is a second-order effect but real over a long horizon.

Credit risk. AAA is the highest domestic rating, and CPSE bonds carry implicit comfort from government ownership, but a fund is not capital-guaranteed and there is no DICGC cover as there is on a bank deposit up to Rs 5,00,000. A downgrade or, in the extreme, a default in the underlying portfolio would hit the NAV. The probability is low for AAA PSU paper, but the structural point stands: an FD is a deposit obligation of the bank, and the ETF is a claim on a portfolio of bonds. They are not the same kind of safety.

Where these funds fit in an NRI portfolio

Given all that, the Bharat Bond ETF is not useless after Section 50AA. It is just no longer the tax play it was sold as. It fits in a few specific situations.

It fits when you want to lock a yield for a long, fixed horizon that an FD cannot match, for example funding a goal in 2032 or 2033 and wanting today's rate guaranteed against a falling-rate environment, where the reinvestment risk of rolling short FDs worries you more than the slab tax.

It fits when you want diversification across many AAA PSU issuers rather than concentrating a large sum in one or two banks beyond the DICGC cover.

It fits when you value daily tradability and the option to exit on the exchange, accepting the price risk that comes with it.

It does not fit as a tax-efficient FD substitute for a 30%-bracket NRI with foreign-earned money to deploy, because on equal pre-tax yields the tax-free NRE FD simply keeps more. And it does not fit cleanly for US and Canada residents, for reasons in the edge cases. For the fixed-income core that you want genuinely safe and tax-free, the NRE FD remains the default; the Bharat Bond ETF is a satellite for the specific reasons above.

Worked example: Rs 20,00,000, Bharat Bond ETF vs NRE FD

Take a non-resident in the 30% bracket (4% cess, no surcharge at this level) with Rs 20,00,000 of foreign-remitted money to deploy for three years. Assume the Bharat Bond ETF carries a YTM of 7.3% and the NRE FD pays 7%, so the ETF even has a small yield edge. We hold both for three years. (Expense ratio on the ETF is around 0.01%, immaterial here, so I net it into the YTM.)

Option A: Bharat Bond ETF (units bought today, Section 50AA applies)

  • Invest Rs 20,00,000 at an effective 7.3% compounded for 3 years.
  • Value after 3 years: 20,00,000 x (1.073)^3 = Rs 24,70,886.
  • Capital gain: 24,70,886 minus 20,00,000 = Rs 4,70,886.
  • The gain is deemed short-term under Section 50AA, taxed at slab. Tax at 30% plus 4% cess = 31.2% of Rs 4,70,886 = Rs 1,46,916.
  • The AMC deducts TDS at redemption (about 30% plus cess on the gain), roughly this same amount, so you receive proceeds net of it with no further bill if the slab matches.
  • Post-tax value: 24,70,886 minus 1,46,916 = Rs 23,23,970.
  • Post-tax gain: Rs 3,23,970, an effective annualised post-tax return of about 5.0%.

Option B: NRE fixed deposit at 7%

  • Invest Rs 20,00,000 at 7% compounded for 3 years.
  • Value after 3 years: 20,00,000 x (1.07)^3 = Rs 24,50,086.
  • Interest: Rs 4,50,086, exempt under Section 10(4)(ii). No TDS, no Indian tax.
  • Post-tax value: Rs 24,50,086.
  • Post-tax gain: Rs 4,50,086, an annualised post-tax return of 7.0%.

The result: even though the Bharat Bond ETF starts with a higher pre-tax yield (7.3% vs 7%), the NRE FD ends ahead after tax by Rs 1,26,116 over three years (Rs 24,50,086 versus Rs 23,23,970). The FD keeps the full 7%; the ETF keeps about 5.0%. For a 30%-bracket non-resident, the ETF would need to out-yield the FD by more than 3 percentage points pre-tax just to draw level after tax, which no comparable-risk AAA bond fund will do. The slab tax under Section 50AA simply overwhelms the small yield edge.

One honest qualifier on the home-country side: the NRE interest, though tax-free in India, may be taxable in your country of residence under its worldwide-income rules (the UK, US and Canada generally tax it; the UAE does not). But the Bharat Bond ETF gain is equally taxable at home, so the home-country layer does not change the India-side ranking. For a UAE-resident NRI, the numbers above are the real after-tax numbers and the FD's win is total. For a UK, US or Canada resident, apply your home rate to both legs, and on the India leg the FD still wins.

Edge cases

Held to maturity versus early exit. The whole predictability case for a Bharat Bond ETF rests on holding to the target date. The published YTM is the return you should expect only if you hold to maturity and reinvest coupons at similar rates. If you sell on the exchange before maturity, you take the market price, which moves inversely to interest rates: a rate rise since purchase means a lower exit price and possibly a capital loss, even with a positive headline yield. If your horizon is genuinely uncertain or shorter than the ETF's maturity, an FD of matching tenure or a liquid fund is a cleaner fit than betting on the exit price of a long-dated bond ETF.

Pre-April-2023 units. The April 2030 and April 2031 series launched before the Section 50AA cutoff, so any units you bought before April 1, 2023 are grandfathered out of the automatic short-term deeming and follow the older holding-period logic, with long-term gains now at 12.5% without indexation after July 23, 2024. Do not redeem legacy units assuming they are taxed like new ones; check acquisition dates, because the fund applies first-in-first-out and your oldest, most favourably taxed units leave first.

US and UK residents: the PFIC and offshore-fund overlay. This is the trap that flips the decision hardest. For a US person, a Bharat Bond ETF or FoF is a Passive Foreign Investment Company (PFIC), and PFIC taxation under the default excess-distribution rules is punitive, with interest charges on deferred gain, covered in the Indian mutual funds PFIC trap and the PFIC-safe investing routes. For a UK resident, the fund is likely a non-reporting offshore fund, so the gain is taxed as offshore income gain at income rates rather than capital gains rates, covered in UK NRI Indian funds and offshore income gains. For both, an FD (a deposit, not a fund) sidesteps these fund-specific penalty regimes entirely. Combined with the AMC blocks on US and Canada residents, the Bharat Bond ETF is usually a worse idea than the slab maths alone suggests for these NRIs, and the deposit is cleaner on every axis.

The NRE FD alternative, restated. For the fixed-income core that you actually want safe and tax-free, the NRE FD is the default for a non-resident, and it wins the tax leg decisively. The Bharat Bond ETF earns a satellite allocation only where its specific strengths matter: locking a yield to a distant date against reinvestment risk, diversifying beyond a single bank, or daily tradability. If none of those three apply to your situation, the slab tax under Section 50AA means the FD is the better call.

RNOR and return. In your first few years back in India you may qualify as Resident but Not Ordinarily Resident, covered in NRI residency and RNOR rules. Your NRE account status changes the moment you become a resident under FEMA, so the NRE interest exemption under Section 10(4)(ii) stops when you return, a point detailed in NRE/FCNR interest taxable after return. If you are within a year or two of returning, factor in that the FD's tax-free status has an expiry date tied to your residency, while the ETF's slab treatment does not change.

The closing read

The Bharat Bond ETF is a genuinely well-designed instrument: passive, near-zero cost, AAA PSU credit, and a target-maturity structure that gives you a predictable yield to a known date in a way an open-ended debt fund never can. None of that is the problem. The problem is the tax story attached to it. The benefit that made target-maturity funds the smart debt allocation, 20% with indexation after three years, died on April 1, 2023, and Section 50AA replaced it with slab-rate taxation, no indexation, and TDS withheld at source on every redemption.

For most non-residents deciding where to park fixed-income money in India, the NRE FD wins on tax, and it wins clearly. In the worked example, the FD beat a higher-yielding Bharat Bond ETF by Rs 1,26,116 on Rs 20,00,000 over three years, purely on tax. The Bharat Bond ETF earns its place only on three specific grounds: you want to lock a yield to a distant maturity that an FD cannot reach and you fear reinvestment risk, you want diversification across many AAA PSU issuers rather than one bank, or you value daily tradability. For US and Canada residents, the AMC blocks and the PFIC or offshore-fund overlays push the answer further toward the deposit. If your relationship manager is still selling the Bharat Bond ETF as "tax-efficient if you hold past three years," he is quoting a rule that was repealed almost three years ago. Check your slab, your residency, your horizon, and your purchase dates, then in most cases pick the NRE FD and treat the Bharat Bond ETF as a satellite, not the core.

Related guides


This guide is general information, not personal tax or investment advice. The taxation of target-maturity and debt funds under Section 50AA, the definition of a specified mutual fund, the Bharat Bond series and their yields, NRE FD interest exemptions, TDS rates, surcharge and cess, AMC acceptance of US and Canada residents, and repatriation limits all turn on your specific facts, your residency status under both Indian law and your country of residence, and rules that change with each Finance Act. Yields to maturity and expense ratios change over time and across series; verify the live figures from the scheme offer document before acting. Interest tax-free in India may be taxable in your country of residence. Consult a qualified chartered accountant or cross-border tax adviser before acting.

Frequently asked questions

Can NRIs invest in Bharat Bond ETFs and FoFs?

Yes. NRIs can invest in Bharat Bond ETFs and the matching fund-of-funds, subject to the scheme offer document. The ETF trades on the NSE and BSE and needs an NRI demat account; the FoF is bought like any mutual fund and needs no demat. Invest on a repatriable basis through an account linked to your NRE account, and the entire proceeds are freely repatriable. Invest from an NRO account and the units are on a non-repatriable basis, with proceeds repatriable only up to USD 1 million per financial year across all NRO funds. US and Canada residents are often blocked, because many Indian AMCs restrict those residents under FATCA compliance, so confirm the AMC accepts your residency before you start the paperwork.

How are Bharat Bond ETF gains taxed for NRIs after April 2023?

A Bharat Bond ETF is a specified mutual fund under Section 50AA. For units bought on or after April 1, 2023, any gain on redemption is deemed short-term capital gain and taxed at your applicable slab rate, regardless of how long you held the units. There is no indexation and no long-term capital gains rate. The old benefit of 20% with indexation after a three-year hold is gone. For a non-resident in the 30% bracket, the gain is taxed at 30% plus surcharge and cess, and the AMC deducts TDS at source on the gain at redemption, typically 30% plus surcharge and cess. You recover any excess only by filing a return and claiming a refund.

Is a Bharat Bond ETF better than an NRE FD for an NRI?

On tax, no, for most non-residents. A Bharat Bond ETF gain is taxed at your slab under Section 50AA, while NRE fixed-deposit interest is exempt from Indian tax under Section 10(4)(ii) with no TDS and full repatriation. On a like-for-like pre-tax yield, the NRE FD keeps more after tax for a 30%-bracket NRI. The Bharat Bond ETF earns its place on a longer locked yield to a distant maturity, daily tradability, and AAA PSU diversification beyond a single bank. But it carries duration and credit risk an FD does not, and for US and UK residents it is a PFIC or offshore fund with a punitive home-country overlay the FD avoids.

, NRI Finance Writer

Rakesh Sinha is a technology professional and an NRI since 2016. He holds a master’s from Carnegie Mellon University and a BTech in Computer Science from IIT Guwahati, and has worked at Microsoft, Cisco, InMobi and Google across Bengaluru, the United States and London. He has personally navigated the decisions these guides cover: moving foreign salary and tech-company RSUs across borders, opening NRE, NRO and FCNR accounts, filing Indian returns as a non-resident, and claiming DTAA relief between the US, UK and India. How these guides are written and reviewed.

Disclaimer: This guide is educational and general in nature. It is not individual financial, tax, or legal advice. Tax and FEMA rules change and your situation may differ, so confirm specifics with a qualified chartered accountant or financial adviser before acting. See our editorial standards for how these guides are researched, reviewed and updated.