Cost basis in an annuity is the total amount of after-tax money you have invested in the contract. It represents the portion of your annuity that has already been taxed and will not be taxed again when you withdraw it. Knowing your cost basis is essential for calculating how much of each withdrawal is taxable.
What Is Cost Basis in an Annuity?
Your cost basis (also called “investment in the contract” by the IRS) is the sum of all premiums you paid into the annuity with after-tax dollars. This is the money you already paid income tax on before putting it into the annuity.
For example, if you purchased a fixed annuity with $100,000 from your savings account, your cost basis is $100,000. Any growth above that amount is taxable gain.
Cost Basis in Qualified vs. Non-Qualified Annuities
The type of money used to fund your annuity determines your cost basis:
Non-Qualified Annuity (After-Tax Money)
If you bought your annuity with money from a savings account, brokerage account, or other after-tax source, your cost basis equals your total premium payments. You will only pay tax on the gains above your cost basis.
Example: You invest $100,000. After 5 years, the account is worth $130,000. Your cost basis is $100,000. The taxable gain is $30,000.
Qualified Annuity (Pre-Tax Money: IRA, 401k)
If your annuity was funded with pre-tax dollars (traditional IRA rollover, 401(k) transfer), your cost basis is typically $0. Since the money was never taxed going in, the entire balance is taxable upon withdrawal.
The exception is if you made non-deductible contributions to a traditional IRA. Those contributions would be part of your cost basis. IRS Form 8606 tracks this.
How Cost Basis Affects Annuity Withdrawals
The IRS uses different rules depending on whether you take partial withdrawals or annuitize the contract:
Partial Withdrawals (LIFO Method)
For non-qualified annuities, the IRS applies a “last in, first out” (LIFO) rule. This means gains are considered withdrawn first. You pay ordinary income tax on every dollar you withdraw until all the gain has been distributed. Only after the entire gain is withdrawn do you begin receiving tax-free return of your cost basis.
Example: Your annuity has a $100,000 cost basis and $30,000 in gains (total value $130,000). If you withdraw $20,000:
- The entire $20,000 is treated as taxable gain (LIFO)
- You owe ordinary income tax on the full $20,000
- If you are under 59 1/2, you also owe a 10% early withdrawal penalty on the $20,000
Annuitization (Exclusion Ratio)
If you annuitize your contract (convert it to a stream of periodic payments), each payment is split between taxable gain and tax-free return of cost basis using the exclusion ratio. This spreads the tax burden evenly over the payment period rather than front-loading it.
Exclusion ratio formula:
Exclusion Ratio = Cost Basis / Expected Total Payments
Example: Your cost basis is $100,000 and you are expected to receive $150,000 in total payments over your lifetime. Your exclusion ratio is 66.7%. That means 66.7% of each monthly payment is tax-free (return of basis) and 33.3% is taxable income.
What Changes Your Cost Basis?
Several events can alter your cost basis over the life of the contract:
| Event | Effect on Cost Basis |
|---|---|
| Additional premium payment | Increases basis by the amount paid |
| Partial withdrawal of gain (LIFO) | No change to basis (gain withdrawn first) |
| Partial withdrawal exceeding gain | Reduces basis by the amount beyond gain |
| 1035 exchange to new annuity | Basis carries over to the new contract |
| Death of owner | No step-up in basis (unlike stocks or real estate) |
| Annuitization payments | Basis is recovered gradually via exclusion ratio |
Important: No Step-Up in Basis at Death
Unlike stocks, real estate, or mutual funds, annuities do not receive a step-up in cost basis when the owner dies. This means your beneficiaries inherit your original cost basis and must pay income tax on all the accumulated gains.
For example, if you invested $100,000 and the annuity grew to $150,000, your beneficiary owes income tax on the $50,000 gain. This is an important consideration for estate and wealth transfer planning with annuities.
How to Find Your Cost Basis
- Check your original annuity application for the initial premium amount
- Review annual statements from the insurance company, which typically list your cost basis and current gain
- Request a cost basis letter from the insurance company if you are planning a withdrawal or surrender
- Check IRS Form 1099-R issued at withdrawal time, which reports the taxable amount and may reference your basis
- For qualified annuities (IRA/401k): Review IRS Form 8606 for any non-deductible IRA contribution records
Cost Basis and 1035 Exchanges
When you do a 1035 exchange (transferring one annuity to another without triggering taxes), your cost basis carries over to the new contract. The gain also carries over. This is important to track because your new insurance company may not have records of your original purchase.
Always keep documentation of your original premium payments and any 1035 exchange paperwork.
Frequently Asked Questions
Is my cost basis the same as my account value?
No. Your cost basis is the total after-tax premiums you paid into the annuity. Your account value includes your cost basis plus any accumulated gains. The difference between the two is your taxable gain.
Do I pay taxes on my cost basis when I withdraw?
No. Your cost basis represents money you already paid taxes on. Only the gains above your cost basis are taxable. However, under LIFO rules, gains are withdrawn first, so early withdrawals from a non-qualified annuity are typically 100% taxable until all gains have been distributed.
What is my cost basis if I rolled over a 401(k) into an annuity?
If the 401(k) was funded entirely with pre-tax contributions, your cost basis is $0. The entire annuity balance is taxable upon withdrawal. If you made after-tax contributions to the 401(k), those amounts would be part of your cost basis.
Does a 1035 exchange reset my cost basis?
No. Your cost basis carries over from the old contract to the new one. The gain also carries over. A 1035 exchange is tax-deferred, not tax-free. You will eventually pay tax on the accumulated gains when you withdraw.
Can I increase my cost basis?
Yes, by making additional premium payments to the annuity with after-tax money. Each additional payment increases your cost basis. However, many MYGAs and fixed annuities are single-premium contracts that do not accept additional deposits after the initial purchase.
