A Roth conversion generally counts for the calendar year in which the conversion occurs, while an IRA contribution for 2025 could generally be made as late as April 15, 2026. Those are separate deadlines: making a prior-year contribution does not make a later conversion count for that prior year. Custodians may also set earlier processing cutoffs, so check the current instructions for your account.
Why the contribution and conversion deadlines differ
An IRA contribution is designated for a tax year, and the deadline for most people to make a 2025 contribution was April 15, 2026. A conversion is a separate transaction: taxable amounts converted from a traditional IRA to a Roth IRA are generally included in income for the calendar year the conversion takes place. The IRS sets the tax-year treatment; a custodian sets operational submission and processing instructions.
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If you make an IRA contribution between January 1 and the tax-filing deadline, tell the custodian which tax year it is for. Otherwise, the custodian may treat it as a contribution for the current year. See IRS Publication 590-A.
Can a 2025 contribution made in 2026 fund a 2025 conversion?
You could generally make a 2025 IRA contribution through April 15, 2026, but a conversion completed in 2026 generally belongs to the 2026 tax year—not 2025—even if the money came from a contribution designated for 2025. The contribution’s designation does not backdate a later conversion.
The IRS describes conversion methods including transfers between trustees and transfers within the same trustee arrangement. The key timing question is when the conversion occurs, not whether the money was contributed during the preceding tax year. This is distinct from the 60-day rollover method; do not treat that period as an extension of the calendar-year deadline for a conversion to count in a particular year. See IRS Publication 590-A.
How Fidelity and Schwab describe their year-end cutoffs
Custodian deadlines are processing policies, not IRS deadlines. They can require action well before December 31 to allow a conversion to be completed in time.
| Institution | Published timing | How to interpret it |
|---|---|---|
| Fidelity | Fidelity states that its submission deadline is 4 p.m. ET on December 31 for a given tax year, or 4 p.m. ET on the last business day of the year when December 31 falls on a weekend. | This is Fidelity-specific submission guidance. Check the current page and your account’s instructions for the year you are converting. |
| Schwab | The Roth IRA Conversion Form located for this article says to submit by December 1 to ensure completion by December 31. The surfaced form is marked ©2024. | This is a recommendation on that form, not an IRS rule or proof of a current, universal Schwab policy. Verify the latest form and account instructions. |
Read the current instructions before initiating a conversion: submission and completion are not necessarily the same event. The reviewed guidance does not establish settlement times for every asset, transfer method, or customer circumstance, so a last-minute contribution or transfer may not be available to convert by year-end.
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What happens if you miss the year-end conversion cutoff
If the conversion occurs in the following calendar year, it generally is reported for that later year. A custodian’s cutoff can affect whether it can complete your transaction in time, but it does not change the IRS’s tax-year rule for other institutions. The IRS does not treat a later conversion as a prior-year conversion simply because the contribution was designated for that prior year.
Do not assume you can undo a completed conversion if the timing or tax result is not what you expected. Fidelity states, “Once your conversion is complete, it can’t be reversed.” IRS guidance also says conversions made in 2018 or later cannot be recharacterized as having been made to a traditional IRA. See Fidelity’s conversion guidance and IRS Publication 590-A.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Report the conversion on your tax return
For a 2025 conversion from a traditional, SEP, or SIMPLE IRA, IRS Publication 17 instructs taxpayers to use Form 8606, subject to the publication’s stated exception, to report the conversion and calculate the amount included in income. Use the instructions for the relevant tax year and account for any after-tax basis that applies to your situation. See IRS Publication 17 and the 2025 Instructions for Form 8606.
Quick Recap
Deadline checklist
- Identify whether you are making a contribution, converting an existing IRA balance, or doing both; they have different timing rules.
- For a contribution made in the January-to-April window, specify the intended tax year to the custodian.
- For a conversion intended to count in a calendar year, allow enough time for the custodian to complete it under its current instructions.
- Confirm the applicable year-end cutoff directly with your custodian, including any weekend or holiday adjustment.
- Before submitting, consider the tax consequences and the fact that a completed post-2017 conversion generally cannot be recharacterized back into a traditional IRA contribution.
- Keep records needed to complete Form 8606 for the conversion’s tax year.
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