Originally Posted by RockyBoy

No complicated formula, just a very small amount that goes up a tiny bit each year. Back in the 60's when they came up with this idea, the advance values might have been alot. Nowadays, it really screws up your witholding and makes it impossible to attempt to not get a tax return. On your advance check they take out no taxes and on your clean up check they take out almost 40%. I've thought about changing my witholding allowances every two weeks to try and even stuff out. Here are the tables they use for the advance values.

YearAmount1st12502nd13003rd13004th14005th15006th17007th18008th20009th230010th250011th280012th3000

I'm not smart enough to make the info work as a table, hopefully you can use your decoder to figure it out.