What is the FIFO method in Mutual Funds?

Investing money in mutual funds is convenient for most investors. You pick a fund, start a SIP or invest a lump sum, and then let it run. Confusion occurs when you decide to take some money out. That is when taxes come into the picture, often in ways investors do not expect.

When you redeem mutual fund units, the transaction is not treated as one simple sale. The tax department does not look at it as “money invested” and “money withdrawn”. Instead, it follows a fixed rule to decide which units are sold first. This rule is called the FIFO method.

The FIFO method plays a big role in how your profit is taxed. It decides whether your gains fall under short-term capital gains (STCG) or long-term capital gains (LTCG). This also affects how much tax you pay and whether you can use the ₹1.25 lakh long-term capital gains exemption available on equity mutual funds. Many investors assume taxes apply only when large amounts are withdrawn, but FIFO can trigger tax even on smaller redemptions.

This becomes even more important if you invest through SIPs, lump sum investments, mutual fund switches, or Systematic Withdrawal Plans (SWPs). A common belief is that you can choose which units to sell, usually the most recent ones. In reality, Indian tax laws do not allow this choice. The FIFO method is compulsory and is applied automatically, no matter how or when you redeem your investment.

FIFO Method in Mutual Funds: Explained 

The FIFO (First In, First Out) method is the rule used to decide which mutual fund units are treated as sold when you withdraw your money. It comes into play every time you redeem units from a mutual fund, whether the amount is small or large.

Simply put, the units you bought earlier are considered sold before the ones you purchased later. It does not matter when you place the redemption request or which investment you had in mind while withdrawing. Once you sell, the FIFO method takes over automatically.

To understand the meaning of first in first out in simple words, think of it this way:
The oldest mutual fund units in your portfolio are redeemed first, and the newer units remain invested.

You do not get the option to choose which units should be sold. Even if your intention is to withdraw money from a recent investment, the FIFO method overrides that choice. This is not a setting you can change on your investment platform, nor can a broker alter it for you.

The FIFO method applies to all types of mutual fund transactions, including:

• Lump sum investments
• SIP investments
• Partial redemptions
• Systematic Withdrawal Plans (SWPs)
• Mutual fund switches

FIFO is not optional. It is a mandatory rule under Indian income tax laws and is followed automatically by mutual fund registrars and the tax department while calculating capital gains and taxes.

Understanding First-In, First-Out

Mutual funds allow multiple purchases over time at different NAVs. Without a standard rule, calculating capital gains would become complex and open to manipulation.

The FIFO method brings consistency by fixing the order of unit redemption. It ensures:

• Uniform tax treatment for all investors
• Accurate classification of STCG and LTCG
• Transparent reporting to tax authorities

FIFO vs Unit Holding Period

Each mutual fund unit has its own holding period. FIFO links directly to this concept.

• Units held for 12 months or less (equity funds) generate Short-Term Capital Gains (STCG)
• Units held for more than 12 months generate Long-Term Capital Gains (LTCG)

For debt mutual funds, holding period rules depend on the investment date and applicable tax provisions.

FIFO determines which purchase date applies when you redeem units.

How FIFO Impacts Your Capital Gains Tax

Equity Mutual Funds – Current Tax Rules

As per current Indian tax laws:

Short-Term Capital Gains (STCG)

• Applicable if units are held for 12 months or less
• Taxed at 20% plus applicable surcharge (if any) and cess

Long-Term Capital Gains (LTCG)

• Applicable if units are held for more than 12 months
• Gains above ₹1.25 lakh per financial year are taxed at 12.5% without indexation

FIFO directly decides whether your gains fall under STCG or LTCG.

Old Tax Regime vs New Tax Regime

Capital gains taxation remains unchanged under both regimes, effective from 23 July 2024:

FIFO applies irrespective of the tax regime you choose.

The FIFO Example: A Practical Walkthrough

First In First Out Example:

Lump Sum

You invest in an equity mutual fund as follows:

In Feb 2024, you redeem 500 units at NAV ₹150.

FIFO calculation:

• First 500 units bought in Jan 2022 are sold first
• Holding period: more than 12 months
• LTCG applies

Gain calculation:

• Sale value: 500 × ₹150 = ₹75,000
• Purchase value: 500 × ₹100 = ₹50,000
• LTCG = ₹25,000

Since this is within the ₹1.25 lakh limit, no tax payable.

Partial Redemption

You redeem only 300 units.

FIFO still applies:

• Units redeemed come from the Jan 2022 purchase
• LTCG is calculated only on those 300 units

FIFO in SIPs: Why Every Instalment is a New Investment

Each SIP installment creates a new lot of units with its own purchase date, cost, and consequent holding period. Because the first in first out process requires older units to be treated as sold first, you must consider each SIP purchase as a separate transaction for tax purposes.

For example, if you started a ₹10,000 monthly SIP in July and continued until the next March, by the time you redeem in April, those units from July and August will be the first to be considered sold, even if you invested smaller amounts later. Because the holding period determines STCG or LTCG classification, knowing exactly when each installment completes 12 months is essential.

A common misunderstanding among SIP investors is that the most recent units will be sold first, especially when the redemption amount is tied to a recent financial goal. However, due to FIFO, redeemed units for any SIP withdrawal or lump-sum sale are always drawn from the earliest purchase lot, regardless of when you place the redemption request. This can unexpectedly trigger STCG on units that have not completed 12 months since purchase, resulting in higher tax. 

How FIFO Affects Capital Gains Across Multiple Years

If you have continued a SIP over several years, you may now have units spanning multiple holding periods and NAVs. With FIFO, older units will be redeemed first when you make a partial withdrawal or full redemption. This causes a mix of tax implications:

• Units held beyond 12 months will qualify for LTCG, and gains from these will be taxed at 12.5% only on amounts exceeding ₹1.25 lakh per year. 
• Units still within their first 12 months of purchase will be classified as STCG and taxed at 20% plus surcharge and cess, which can be significant. 

For example, suppose you have held units from April 2023 to March 2025. If you redeemed units  in April 2025, FIFO means units from April to December 2023 are treated as sold first. If some of these units have completed 12 months, they will be taxed under LTCG (with the ₹1.25 lakh exemption applicable across all such gains). Then the next oldest lot (from January –March 2024) will be tested for 12-month completion and taxed accordingly, potentially as STCG if they have not reached one year. It is this structured sequential redemption that often produces multiple tax brackets even in one transaction.

Tax Planning with FIFO in SIPs

Achieving tax efficiency with the FIFO method requires careful planning of redemption timing. Since FIFO dictates the oldest units are deemed sold first:

• Plan redemptions after units complete 12 months if your objective is to qualify for LTCG treatment.
• Consider spreading redemption across more than one financial year to take advantage of the ₹1.25 lakh LTCG exemption limit.
• Check the exact purchase dates on your mutual fund statement or consolidated capital gains report before deciding when to sell, as this will affect your planned tax outcome. 

For example, if you expect gains above ₹1.25 lakh, you might redeem just enough LTCG-eligible units to stay within the exemption limit in one year and defer the rest to the next year. This avoids paying 12.5% tax on a larger LTCG sum in one year.

Special Cases: SIP Top-ups and Switches

If you increase your SIP amount, each top-up becomes a separate purchase lot. Under FIFO, those top-up units are considered after all earlier SIP units have been redeemed. Likewise, if you switch from one fund to another, the redemption leg uses FIFO to identify which units have been sold.

For example, if you switch 50% of your holdings in Fund A to Fund B, FIFO applies to Fund A units first. If you make that switch before the first lot of units completes 12 months, you may be liable for STCG on those units even if the overall gain is modest. Likewise, units credited in the new fund begin a fresh holding period for future redemptions.

Integrating Losses with FIFO Gains

FIFO applies to units sold at a loss as well as gains. The capital loss for units sold is calculated with FIFO and can be set off against capital gains in the same assessment year. This can result in effective tax savings:

• Short-Term Capital Loss (STCL) can be set off against both STCG and LTCG gains in the same year.
• Long-Term Capital Loss (LTCL) can only be set off against LTCG.
• Any set-off loss can be carried forward for up to eight assessment years if you file your returns on time. 

Conclusion

The FIFO method plays a key role in how mutual fund redemptions are taxed in India. It decides which units are considered sold first and, as a result, how your capital gains are calculated. This directly affects whether your gains are taxed as short-term capital gains (STCG) at 20% or as long-term capital gains (LTCG) at 12.5%, after exhausting the ₹1.25 lakh exemption available on equity funds.

If you invest through SIPs, every installment is treated as a separate purchase. FIFO then decides the exact order in which these installments are sold when you redeem your investment. Because of this, a single redemption can include units bought at different times, leading to different tax outcomes. This becomes more noticeable when you have been investing regularly over several years.

Once you understand how this rule works, planning becomes much easier. You can time your withdrawals better, keep your tax liability under control, and use available exemptions or carried-forward losses more effectively. Paying attention to the FIFO method helps you make more informed decisions and improves your post-tax returns from mutual fund investments over the long term.