Generally, if you owe more than $1,000 in federal taxes, you were required to make quarterly estimated tax payments. If you paid at least 90% of the total tax owed (or 110% if your AGI is greater than $75K for Single filers and $150K for Married Filing Jointly), then you are good and aren't required to pay estimates.
The estimated quarterly tax dates for tax year 2025 were/are:
- 1st quarter (January 1–March 31): April 15, 2025
- 2nd quarter (April 1–May 31): June 16, 2025 (since June 15 is a weekend)
- 3rd quarter (June 1–August 31): September 15, 2025
- 4th quarter (September 1–December 31): January 15, 2026
Here's more info with Common Questions about Estimate Taxes.