Payments I make for my client and then I get reimbursed

Hi there

I am a solo trader and every month I make some payment for my client with my credit card which I am then reimbursed for when I claim my expenses.

I don't want the reimbursement to be classified as income as I would then have to pay taxes on it so I am not sure how to manage these transactions. Can you help?

Just to clarify, I don't pay VAT.

Thanks

Elena