I applied overpayment of state tax refund to next year tax. However, im not required to pay estimate taxes. Can I overpay taxes instead of accepting refund?

[bradwaymarco]

Its okay to overpay when not required?

[Critter-3]

Of course ... the feds/states love when taxpayers give them free use of your money interest free for no reason. 

[Anonymous]

The IRS sort of frowns on this but it's not illegal or improper.  the states just love it. free use of your money until next year and if you continue to apply the overpayment free use forever.