TIPS Calculator (Treasury Inflation-Protected)

Calculate TIPS real return and inflation-adjusted principal. Compare to nominal Treasury bonds.

By Konstantin Iakovlev · Updated April 2026 · Source: SEC

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%
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Years to Maturity

Total Value at Maturity

$15,749.01

Adjusted Principal

$13,439.16

Total Coupon Income

$2,309.84

TIPS Return Summary

Original Principal$10,000.00
Inflation-Adjusted Principal (10 yr)$13,439.16
Principal Appreciation$3,439.16
Total Coupon Payments$2,309.84
Total Return$5,749.01
Annualized Nominal Return4.65%
Annualized Real Return2.00%

TIPS vs Nominal Treasury

Nominal Treasury Yield (est.)5.00%
Nominal Treasury Total$15,000.00
Nominal Real Value (after inflation)$11,161.41
TIPS Total Value$15,749.01
If inflation is higher than expectedTIPS wins
If inflation is lower than expectedNominal wins

Growth Over Time

Year 5Principal: $11,592.74 | Coupons: $1,069.73
Year 10Principal: $13,439.16 | Coupons: $2,309.84

Use the TIPS Calculator (Treasury Inflation-Protected) above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Treasury Inflation-Protected Securities exist to defend the purchasing power of your money, and this tool projects two things that ordinary bonds hide: your inflation-adjusted principal and your real return. The distinction matters because the Congressional Budget Office projects 2.3% inflation for 2026, and that figure quietly erodes the true value of any fixed-rate holding.

The math begins with the inflation-adjusted principal, found by multiplying your original principal by the cumulative inflation factor, which is simply 1 plus the CPI-U change. Subtracting that inflation adjustment from the nominal return leaves the real return, the number that actually tells you whether your buying power grew.

Two tax and structural quirks deserve attention. TIPS interest and principal adjustments are both taxed as federal income each year, even when you receive no cash for the principal bump. Deflation, while uncommon, can pull your principal below its original par value during the bond's life, but you will never be repaid less than par at maturity.

Example: $10,000 TIPS Investment in 2026

  1. 1 Input: Original Principal = $10,000; Annual Coupon Rate (Real) = 0.5%; Assumed Annual Inflation (CPI-U) = 2.3% (CBO 2026 projection); Investment Period = 5 years.
  2. 2 Calculation: Year 1 Principal Adjustment: $10,000 * (1 + 0.023) = $10,230. Year 1 Interest Payment (real): $10,230 * 0.005 = $51.15. This process iterates for each year, with the principal adjusting before interest is applied.
  3. 3 Intermediate Result: After 5 years, with a consistent 2.3% inflation, your principal would have grown to approximately $11,200. Your total coupon interest received over 5 years would be around $275 (real).
  4. 4 Final Result: Your total inflation-adjusted value after 5 years would be approximately $11,475. This represents a real return that has successfully outpaced inflation, preserving your initial purchasing power and providing a modest real gain, unlike a nominal bond which would have lost purchasing power due to inflation.

Source: SEC · Last updated: April 2026

Frequently Asked Questions

What are TIPS and how do they protect against inflation?
Treasury Inflation-Protected Securities (TIPS) are US government bonds whose principal adjusts with the Consumer Price Index. If inflation rises 3%, your principal increases 3%, and your fixed interest rate is applied to the higher amount, preserving your purchasing power.
Are TIPS a good investment in 2026?
TIPS are valuable when you expect inflation to exceed the break-even rate (the difference between TIPS yield and nominal Treasury yield). In 2026, with the break-even around 2.3-2.5%, TIPS are a solid hedge if you believe inflation will run higher.
How are TIPS taxed?
TIPS interest and the annual inflation adjustment to principal are both taxed as ordinary income at the federal level, even though you do not receive the principal adjustment until maturity. This "phantom income" issue makes TIPS best held in tax-advantaged accounts like IRAs.

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