I have a refund in 2018 and i want to pay tax in advance for 2019

[DoninGA]

You can make estimated tax payments for tax year 2019 at any time up through January 15, 2020 at this IRS website - https://www.irs.gov/payments

[DoninGA]

If you have not yet filed the 2018 tax return you can also apply the 2018 tax return to the 2019 taxes.

To add, change or delete a current year federal tax refund to next year's taxes before you file your tax return -

• Click on Federal Taxes (Personal using Home and Business)
• Click on Other Tax Situations
• Under Additional Tax Payments
• On Apply Refund to Next Year, click on the start or update button

Or enter apply federal refund to next year in the Search box located in the upper right of the program screen. Click on Jump to apply federal refund to next year

The amount applied to next years taxes will be shown on Form 1040 Schedule 5 Line 66 and flows to Form 1040 Line 17