T-Bill Investment Tax Implications 2026 | Income Tax Guide

What Happened?

The latest Treasury Bill auction (October 2026) has been successfully concluded with three tenors—91-day, 182-day, and 364-day—cleared at their notified face value of ₹8,000 crore, ₹8,000 crore, and ₹7,000 crore respectively. Cut-off yields (Yield To Maturity) stand at 5.7281%, 6.2896%, and 6.4891% respectively. This is critical for individual investors, HUFs, corporates, and mutual funds who hold or plan to invest in T-Bills, as the interest income earned is taxable under the Income Tax Act 2025.

Background & Legal Context

Income Tax Treatment of Treasury Bills Under Income Tax Act 2025:

Treasury Bills are short-term debt instruments issued by the Government of India through the Reserve Bank of India (RBI). Unlike fixed deposits or bonds, T-Bills are sold at a discount to face value, and the difference between the purchase price and face value is treated as interest income.

• Classification as Income: Under Section 56(2) of the Income Tax Act 2025 (also Section 56 of the 1961 Act), the discount amount earned on maturity of T-Bills is taxable as "Income from Other Sources" in the financial year of redemption, not on purchase.
• Who Must File Return? Any individual, HUF, or AOP earning T-Bill interest income exceeding the basic exemption limit for AY 2026-27 (₹3,00,000 for individuals below 60 years; ₹5,00,000 for senior citizens) must file an ITR.
• TDS (Tax Deducted at Source): No TDS is deducted on T-Bill interest at the time of purchase or maturity. However, if you hold T-Bills through a broker or custodian, verify their reporting to avoid mismatch in your ITR.
• Capital Gains: If T-Bills are sold before maturity in the secondary market at a price higher than purchase price, the difference qualifies as Short-Term Capital Gains (STCG) under Section 73 of the IT Act 2025. STCG is taxed as per your slab rate.
• Holding Period Exemption: T-Bills have a short maturity (max 364 days), so there is no Long-Term Capital Gains treatment available.

What Does This Mean for You?

For Individual Investors:

If you invested ₹10,00,000 in 364-day T-Bills at the cut-off price of ₹93.92 per ₹100 face value, your cost is ₹9,39,200. On maturity, you receive ₹10,00,000 (face value). The gain of ₹60,800 is taxed as "Income from Other Sources" in AY 2026-27 at your applicable slab rate (nil, 5%, 20%, or 30%). This is why T-Bills are attractive for low-income individuals or retirees in the nil tax bracket.

For Senior Citizens (Aged 60+):

Since the exemption limit for senior citizens in AY 2026-27 is ₹5,00,000, T-Bill interest income below this threshold is fully exempt from tax. This makes T-Bills an excellent tool for senior citizen tax planning.

For Corporate Investors:

Corporates holding T-Bills must account for the interest income at the time of maturity. Under Section 28 of the IT Act 2025, interest income from T-Bills is classified as business income (or income from other sources), depending on the nature of the entity's business. Corporates cannot claim any exemption and are taxed at the flat corporate rate of 20% (or 22% if they were previously subject to Minimum Alternate Tax—MAT).

For Mutual Funds & AIFs:

Debt mutual funds investing in T-Bills must distribute dividend income (if any) or declare units at Net Asset Value (NAV) reflecting accrued T-Bill interest. Unitholders are then taxed on dividends received or capital appreciation—not directly on T-Bill income. However, fund managers must report T-Bill holdings accurately to comply with MCA requirements.

Secondary Market Trading:

If you purchase T-Bills from the secondary market (e.g., a broker) at a premium to the original cut-off price and sell before maturity at a loss, you can claim a short-term capital loss. This loss can be set off against other short-term capital gains in the same financial year or carried forward for 8 years (under Section 74 of the IT Act 2025).

What Should You Do Now?

• Track Your T-Bill Investments: Maintain detailed records of purchase date, purchase price, face value, and maturity date. The Consolidated Account Statement (CAS) from NSDL/CDSL provides this automatically if you hold T-Bills in a demat account.
• Calculate Interest Income for ITR Filing: For AY 2026-27, if your T-Bills matured during FY 2025-26, calculate the discount amount (Face Value - Purchase Price) and report it as "Income from Other Sources" in your ITR-1 or ITR-2 (for individuals/HUFs). Don't report it as capital gains—RTO scrutiny is common here.
• Plan for Tax Liability: With 364-day T-Bills yielding 6.49%, your annual return is lower than fixed deposits or bonds. However, the tax efficiency (no TDS on maturity, flexible income timing) makes it valuable for retirees and HUFs. Review your tax bracket before investing lump sums.
• Claim Exemptions if Eligible: Senior citizens below the exemption threshold (₹5,00,000 for AY 2026-27) should prioritize T-Bills over taxable bonds. HUFs have a separate exemption of ₹2,50,000—double investment is possible via individual + HUF accounts.
• Report in Correct Schedule: While filing ITR for AY 2026-27, report T-Bill interest in Schedule OS (Other Sources), not Schedule CG (Capital Gains). This reduces mismatch penalties.
• Coordinate with Income Tax Dept: If T-Bills are held jointly or in trust, ensure all co-owners file their respective returns reflecting their share of interest income. This avoids aggregation issues and double taxation claims.
• Audit Requirements: If your total income (including T-Bill interest) exceeds ₹1 crore in AY 2026-27, and T-Bills are part of your investment portfolio, your CA may recommend a tax audit under Section 44AB of the IT Act 2025. Plan accordingly.

Key Takeaways

• Interest Income Taxation: T-Bill discount is taxed as "Income from Other Sources" under Section 56(2) of the IT Act 2025 in the maturity year, at your applicable slab rate. No tax exemption for any category of taxpayer (except within the basic exemption limit).
• Yield Context for AY 2026-27: With 364-day T-Bills at 6.49% YTM, annual interest on ₹10 lakh is ₹64,900. After tax at 20% slab rate, net return is ₹51,920—compare this with other fixed-income options before investing.
• Secondary Market Losses Permitted: If you sell T-Bills at a loss before maturity on the secondary market, the loss qualifies as Short-Term Capital Loss and can be adjusted against other gains or carried forward for 8 years. This provides strategic tax planning opportunities.
• No TDS Complication: Unlike bank fixed deposits, T-Bills involve no TDS at source. This simplifies ITR filing but requires disciplined record-keeping to avoid mismatch notices from the tax department.
• Senior Citizen & HUF Advantage: With higher exemption limits (₹5,00,000 for seniors in AY 2026-27), T-Bills are tax-efficient investments for retirees and Hindu Undivided Families. Consider this in your succession and estate planning.

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