I'm writing an Excel or MS Access application to handle my small company's specific payroll needs. I'm getting hung up on the amount of effort required to update the spreadsheet or database each year. It looks like I would need to update dozens (hundreds?) of figures every year, which would be way more effort than it is worth.
I'm looking for some way to automate this process in an ongoing basis. My first thought was to retrieve the tax rate tables in a downloadable, import-friendly format (CSV, TXT, XLS, XLSX, XML, etc.).
I've searched the IRS website but can't find anything besides the PDFs. Ideally, there would be some official IRS repository of the current tax tables in a format that could be imported annually into the custom payroll software system I am writing. If not an official IRS product, perhaps something maintained by a reputable third-party (a la, taxrates.com, a website that offers state sales tax tables).
I am specifically looking for payroll withholding tables, like those shown in IRS Publication 15. I don't need the full tables, just those on pages 45-46 of the linked publication.
As an alternative, is there a reliable way to generate the tables on pages 45-46 from a master rate table, such as the one at the top of this page: 2015 Tax Brackets?