The basic amount of Working Tax Credit is up to £1,960 a year-you could get more (or less) depending on your circumstances and income. Use the tax credits calculator to work out how much you could get. You can apply for Working Tax Credit even if you don’t have children or you’re on leave or about to start a new job.You can’t claim tax credits and Universal Credit at the same time.he basic amount of Working Tax Credit is up to £1,960 a year-you could get more (or less) depending on your circumstances and income. Use the tax credits calculator to work out how much you could get. You can apply for Working Tax Credit even if you don’t have children or you’re on leave or about to start a new job.