Tax code for 2023/24 affecting income tax in 2022/23

Figures in my PAYE income and income tax for 2022/23 and 2023/24 are correct. I worked in same job and same company for years. And my company has already helped me to pay UK tax before posting monthly income to my bank account. But tax code for 2022/23 is 1257L and tax code for 2023/24 is 702T, Will tax code in 2023/24 affect my income tax in 2022/23 even my company helped me to settle income tax monthly? I guess YES. After inputing the only income in the tax assesssment in 2022/23, i try to view your calculation. It demands me to pay the additional income tax again. I found that the tax assessment in the portal ignores my personal allowance. I need to pay extra tax,

Hi Ceci Ts,

The calculation in the tax return will reduce the Personal Allowance if your income is over £100,000.
If you did not earn over £100,000 you will need to contact our helpline so that we can explain the calculation
Self Assessment: general enquiries

Thank you.