Estate Tax $15M Exemption Calculator 2026
Calculate federal estate tax under the OBBB $15 million per-person exemption (P.L. 119-21, signed July 4, 2025). OBBB prevented the scheduled sunset to ~$7M. Enter your gross estate, deductions, and prior gifts to see your taxable estate and 40% rate tax.
Federal Estate Tax in 2026 — OBBB Raised the Exemption to $15 Million
The federal estate tax imposes a 40% rate on the taxable portion of an estate — the gross estate minus deductions and the applicable exemption. The One Big Beautiful Bill (OBBB, P.L. 119-21, signed July 4, 2025) raised the per-person estate tax exemption to $15,000,000 for 2026. Without OBBB, the TCJA's elevated exemption (~$13.99M in 2025) would have sunsetted after December 31, 2025, reverting to approximately $7 million per person — creating a massive cliff that would have brought millions of additional estates into the taxable range.
With OBBB, the $15M exemption is permanent and indexed for inflation. Married couples can effectively shelter $30M via portability — the surviving spouse claims the deceased spouse's unused exemption (DSUE) by filing Form 706 to elect portability. The estate must file Form 706 within 9 months of death (6-month extension available) even if no tax is owed, to preserve the portability election. Source: IRS Publication 559, irs.gov/form706. Last updated: May 2026.
Calculating the Taxable Estate — Key Deductions
| Item | Included in Gross Estate? | Deductible? |
|---|---|---|
| Real estate (FMV at death) | Yes | No (deduct mortgages separately) |
| Investment accounts | Yes | No |
| IRAs / 401(k)s | Yes — but pre-tax amounts subject to income tax when heirs withdraw | No |
| Life insurance (owned by decedent) | Yes | No (use ILIT to exclude) |
| Assets to US citizen spouse | Yes (gross) | Yes — unlimited marital deduction |
| Assets to qualifying charities | Yes (gross) | Yes — unlimited charitable deduction |
| Debts, mortgages, loans | No | Yes — reduces gross estate |
| Funeral and admin expenses | No | Yes |
The adjusted gross estate = gross estate − debts − admin/funeral expenses. The taxable estate = adjusted gross estate − marital deduction − charitable deduction. Prior taxable gifts (from Form 709) are added back to the taxable estate when computing the tax base, but a credit is given for any gift tax previously paid. The effective tax is: (taxable estate + adjusted taxable gifts) × progressive rates − applicable exemption credit. Source: IRS Form 706 instructions, IRC §2001.
Estate Tax Planning Strategies Under the $15M Exemption
Even with the $15M per-person exemption, high-net-worth families benefit from planning: (1) Portability election — always file Form 706 to lock in the surviving spouse's DSUE, even if no tax is owed; (2) Annual gifting — $19,000 per recipient in 2026, not counting against the lifetime exemption; (3) Irrevocable trusts — GRATs, SLATs, and CLTs remove appreciation from future estates; (4) 529 superfunding — 5-year lump gift of $95,000 per beneficiary with no gift tax impact; (5) Charitable strategies — CLTs, CRTs, and Donor-Advised Funds (DAFs) reduce taxable estates while supporting causes. Note: state estate taxes have lower exemptions — Massachusetts and Oregon start at $1M. Source: IRS Form 706, IRS Publication 559, irs.gov/newsroom/estate-tax.