Retirement tax questions

That is still not what I am looking for. I already know that the taxable portion for the whole year is going to be 85%. What I am asking is that since my income fluctuated and there are two quarters where we only had a pension and social security is it possible to use pub 505 worksheets 2-1 and 2-7 to figure the current years taxable social security or is it just for figuring estimated tax for next year. It doesn't make sense to me that it would only be for the following year and not for the current year. I might be missing something but the wording is causing me to question it. There is a big difference in my taxes if we get taxed 85% for each quarter instead of only one quarter.