Income shown for 11 months (instead of) as per 26AS

The income (Monthly Consultancy) is showing in 26AS for 11 month instead of 12 month in FY 20-21. The employer accounted my March,2021 invoice in next FY i.e. FY 21-22 and TDS certificate issued for the last month invoice against 1st Qtr of Fy 21-22.

1. Should i show income of 12 months in my income tax return for FY 20-21 irespective of income shown in 26AS.
2. How to take tax credit against TDS certificate issued for income of march 21 in FY 22-23

Pls guide.