What Is Cost Basis in an Annuity? How It Affects Your Taxes

Does Your Cost Basis Actually Reduce What You Owe in Taxes?

Yes — but only on the gain, and the timing matters. Your cost basis is the total after-tax money you put into an annuity. When you take money out, the IRS only taxes the growth above that figure. The catch: for non-qualified annuities, the IRS requires you to withdraw all your gains first before you touch tax-free principal. So the first dollars out are often fully taxable.

What Is Cost Basis in an Annuity?

Cost basis is the total amount you invested in an annuity using money that has already been taxed. It is your “skin in the game” — the portion of the contract that will eventually come back to you tax-free.

For a non-qualified annuity (funded with savings, brokerage, or CD money), your cost basis equals every after-tax premium you paid. If you deposited $150,000 over five years, your cost basis is $150,000. Any growth above that is taxable when you withdraw it.

For a qualified annuity funded with pre-tax money from a traditional IRA or 401(k), your cost basis is typically $0. The IRS never taxed that money going in, so it taxes all of it coming out.

Non-Qualified vs. Qualified Annuities: How Cost Basis Differs

Non-Qualified Annuity (After-Tax Money)

You fund this with personal savings, a brokerage transfer, or a maturing CD. Every dollar you deposit is your cost basis. Only the earnings on top of those deposits are taxable upon withdrawal.

Example: Sandra, 63, deposits $200,000 from her savings account into a 7-year MYGA. Seven years later the account is worth $290,000. Her cost basis is $200,000. The taxable gain is $90,000. If she withdraws the full balance, she owes ordinary income tax on $90,000 — not on the $200,000 she already paid taxes on.

Qualified Annuity (Pre-Tax Money)

If you rolled a traditional IRA or 401(k) into an annuity, cost basis is $0 in most cases. Every dollar you withdraw is taxable because the government gave you a tax deduction when the money first went in.

There is one exception: non-deductible IRA contributions. If you ever put after-tax money into a traditional IRA and tracked it on IRS Form 8606, those amounts become part of your cost basis. This is relatively rare but important to track. Missing it means you pay taxes twice on the same dollars.

The LIFO Rule: Why Gains Come Out First

The IRS does not let you choose which dollars to withdraw first from a non-qualified deferred annuity. Under the “last in, first out” (LIFO) rule, gains are treated as the first dollars out of the contract. You do not touch your tax-free principal until every dollar of gain has been distributed.

This is the opposite of how annuitized payments work and catches many people off guard when they take a partial withdrawal.

Example: David, 67, has a non-qualified annuity with a $100,000 cost basis. The account has grown to $135,000. He wants to take a $25,000 vacation withdrawal.

• Gain in the contract: $35,000
• The full $25,000 withdrawal is treated as taxable gain (LIFO)
• David owes ordinary income tax on the entire $25,000
• His remaining gain in the contract drops from $35,000 to $10,000
• His cost basis of $100,000 is untouched

If David had instead taken a $40,000 withdrawal, the first $35,000 would be fully taxable gain. The remaining $5,000 would be a tax-free return of basis. After that withdrawal, the contract would have a $95,000 cost basis and $0 in gain.

Annuitization and the Exclusion Ratio

When you convert your annuity into a guaranteed stream of payments — a process called annuitization — the LIFO rule no longer applies. Instead, the IRS uses the exclusion ratio to split each payment between taxable and tax-free portions.

The exclusion ratio spreads your cost basis evenly across your expected payments. Each check you receive is partly a return of your investment (tax-free) and partly taxable interest income.

Formula: Exclusion Ratio = Cost Basis / Expected Total Payments

Example: Margaret, 70, annuitizes a non-qualified contract with a $120,000 cost basis. Based on her age and a life-only payout, the insurer calculates she is expected to receive $200,000 in total lifetime payments. Her exclusion ratio is 60% ($120,000 / $200,000). Each monthly check of $1,100 breaks down as:

• $660 tax-free return of basis (60%)
• $440 taxable income (40%)

Once Margaret has received $120,000 in tax-free payments — fully recovering her cost basis — all subsequent payments become fully taxable. If she outlives her life expectancy, every dollar received after that point is ordinary income.

Events That Change Your Cost Basis

No Step-Up in Basis at Death

This is one of the most important and least-discussed facts about annuities. When you die, your annuity does not receive a stepped-up cost basis the way stocks, real estate, and mutual funds typically do under current tax law.

Your beneficiary inherits your original cost basis — not the current account value. They will owe ordinary income tax on all accumulated gains, and those gains are taxed as ordinary income, not at the lower capital gains rate.

Example: Robert bought a non-qualified annuity for $100,000. It grew to $170,000 when he passed away. His daughter receives the $170,000 death benefit. She owes income tax on the $70,000 gain at her ordinary income tax rate. If she is in the 22% bracket, that is $15,400 in federal taxes on the gain.

This is an important consideration when comparing annuities to taxable brokerage accounts for wealth transfer. If leaving money to heirs is a primary goal, talk with a financial advisor or tax professional about how the no-step-up rule fits into your estate plan.

Cost Basis and 1035 Exchanges

A 1035 exchange lets you move money from one annuity to another without triggering taxes. Your cost basis and accumulated gain both carry over to the new contract. The exchange is tax-deferred — not tax-free. You will eventually pay taxes on the gain whenever you withdraw.

One practical issue: the new insurance company receives the money via a direct transfer and may not have your original purchase records. Always keep your original application, annual statements, and the 1035 exchange paperwork. If you lose track of your original premium payments, reconstructing your cost basis becomes much harder.

A common mistake: people who do multiple 1035 exchanges over many years assume each company is tracking their original basis. They are not always. The responsibility falls on the annuity owner — or their tax advisor.

How to Find Your Cost Basis

1. Annual statement from the insurance company. Most carriers list your “investment in the contract” or “cost basis” alongside your current account value and accumulated gain. This is the easiest source.
2. Original annuity application. Your initial premium is documented at the time of purchase. If you made additional deposits, look for subsequent premium confirmation letters.
3. IRS Form 1099-R. When you take a distribution, the carrier issues a 1099-R. Box 2a (taxable amount) reflects the gain distributed. Box 9b (your investment in the contract) may list your cost basis, though this varies by carrier.
4. IRS Form 8606. For annuities funded through a traditional IRA with non-deductible contributions, Form 8606 is your official record of after-tax basis in the IRA. Keep every year’s filing.
5. Call the carrier directly. If you are planning a large withdrawal, surrender, or 1035 exchange, request a formal cost basis letter from the insurance company’s customer service team. Get it in writing.

Frequently Asked Questions

Is cost basis the same as my account value?

No. Your account value is the current worth of the contract — cost basis plus accumulated gains. Cost basis is only the after-tax money you put in. The difference between the two is the taxable gain.

Do I pay taxes on my cost basis when I withdraw?

No — your cost basis is money you already paid taxes on. But under the LIFO rule for non-qualified annuities, gains come out first. Early withdrawals are typically 100% taxable until all gains are exhausted. Only after every dollar of gain has been withdrawn do you receive tax-free return of basis.

What is my cost basis if I rolled over a 401(k)?

If all your 401(k) contributions were pre-tax, your cost basis is $0 and all withdrawals are fully taxable. If you made after-tax contributions to the 401(k), those amounts are part of your basis. Your 401(k) administrator should be able to tell you if you have any after-tax basis in the plan before you roll it over.

Does a 1035 exchange reset my cost basis?

No. Your cost basis carries over unchanged to the new annuity. So does your accumulated gain. A 1035 exchange preserves your tax-deferred status but does not eliminate the eventual tax obligation on gains.

Can I increase my cost basis?

Yes, by making additional after-tax premium deposits. Each deposit increases your cost basis by that amount. Keep in mind that many MYGAs and fixed annuities are single-premium contracts that do not accept additional deposits after the initial purchase. Fixed index annuities may allow flexible premiums during the first year or two — check the contract.

What happens to cost basis if I take a required minimum distribution (RMD) from an IRA annuity?

If the annuity is inside a traditional IRA or other qualified plan, there is no cost basis in the tax sense — all distributions are fully taxable. RMDs do not affect cost basis because the qualified account has no cost basis to begin with.

Related Resources

• Exclusion Ratio Explained: How Annuity Income Is Taxed
• Single Premium Immediate Annuity (SPIA) Guide
• Compare Today’s MYGA Rates
• Annuity Income Calculator
• Get a Free Annuity Quote

Sources

1. IRS Publication 575 — Pension and Annuity Income
2. IRS Form 8606 — Nondeductible IRAs
3. IRS Form 1099-R — Distributions from Pensions, Annuities