Transferable costs

I am enabled as a floorer and in the month of December I purchased stabiliser and edging for the construction of a terrace.

Now, year 2024, I am going to finish the job and draw up my final invoice. Is there a way to carry over my costs from previous year to this financial year so that I not only have profit, but also the costs of my work?

Does anyone have any idea how I can best do this?

Thanks in advance.