The most direct answer to your question is that none of your social security benefits reported on Line 5a is taxable. That is why Line 5b has no amount. From the information you have provided it appears that all your income is your social security benefits. And your combined income is less than the $25,000 threshold for social security benefits being taxable
For the 2019 and 2020 tax years, single filers with a combined income of $25,000 to $34,000 must pay income taxes on up to 50% of their Social Security benefits. If your combined income was more than $34,000, you will pay taxes on up to 85% of your Social Security benefits.
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