Certain of your closing costs can be added to the cost basis of the home, and may reduce your capital gains when you sell. There is a list in publication 523.
https://www.irs.gov/publications/p523
On a refinance, the points must be deducted over the life of the loan. For example, if this is a 30 year or 360 month loan, and you refinanced in July, you could deduct 5/360th of the points on your 2020 tax return. If you used part of the proceeds to substantially remodel your home, then that portion of the points may be deducted at once and the rest spread out over the loan term.
If you were spreading out the points deduction for your previous mortgage over the term of that mortgage, and you refinanced with a different lender, you can deduct the remaining points from the first mortgage as of the date the first mortgage is paid off. If you refinanced with the same lender, the remaining points on the old mortgage plus the points on the new mortgage are added together and deducted over the new term.
You may have paid daily interest on the closing statement, to go from the closing date to the end of that month. That interest is deductible, and is not always included in your 1098. If you can determine from looking at your mortgage statement and your 1098 that the daily interest was not included in the 1098, then you can include it separately.
Anything that I have not mentioned and that is not listed in publication 523 is not deductible and is not an adjustment to your home‘s cost basis.
