IRS penalizes more earners for mistakes, underpayment in estimated tax filings

TTI lead tax research analyst Nathan Rigney addresses how and when to update your Form W-4.

TTI director Gil Charney talks to MarketWatch about the delay in filing this tax season. 

TTI lead tax research analyst Nate Rigney talked with The Lines about sport betting income and says, "[t]axpayers still have a responsibility to report their prize on their tax return as ‘other income.’"

TTI principal tax research analyst Jackie Perlman tells CNBC that for taxpayers to figure out whether or not they should still itemize, they'll have to do their homework.