I’m retired and on social security and pension. How do I calculate how much more I need taken out in taxes so I get refund?

[NCperson]

idea: estimate your taxes at this website as it is set to 2023 tax tables.

https://www.dinkytown.net/java/1040-tax-calculator.html

then you can increase the withholdings at SSA or the pension based on the result or make quarterly payments at the IRS website. 

https://directpay.irs.gov/directpay/payment?execution=e1s1  

But why do you want to increase your refund? that is interest free money you are giving the IRS????