[domdip]

Did you consider simply skipping estimated payments and paying the interest? It's only 3% above the federal funds rate. (Historical real return on equities is usually computed to be higher.)

Or a hybrid (pay a reasonable amount in estimated taxes but don't put any serious effort into getting it exact).

[tamana]

Parent poster is being silly. It's trivial to withold some money for taxes. The pain is in calculating get your 1099 because the stock brokers get it wrong evey year, often more than once .