With the open enrollment period for the Health Insurance Marketplace beginning November 1st, it is the appropriate time to remind taxpayers and preparers of the various Affordable Care Act (ACA) estimators the Taxpayer Advocate Service (TAS) has developed and made available to the public. Whether the taxpayer is an individual or employer, we have several tools available to assist in estimating credits and payments related to the ACA. Keep in mind that they only provide estimates, rather than accurate calculations, to use as a guide in making decisions regarding the taxpayer’s tax situation.