Can I extend my Non-O visa using my work permit without showing a bank statement?

As Tony mentioned it is indeed a PILE o' paperwork to get a yearly extension based on legally working in thailand on a minimum of 40K baht a month salary. Company documents, tax statements, contract, pay verification are just some of what is needed.

That's why Ellie said GO to the immigration office and get the hand out listing the requirements and tell them you're going to use monthly income by legally working as the reason for the extension.

Personally i would ignore the fact you have a work permit and carry on using the 400k method (unless you have problems holding that), its a lot less paperwork.

Yes, you can use your salary with a valid work permit as proof of funds, but, No, you cannot do it just using your work permit.

Go to your local immigration office to get their latest requirements for a 1-year extension based on marriage, especially for financial requirements for work permit holders.

Then you have to ask your employer to provide company papers including tax documents as well as your own tax documents.

If you or your employer cannot meet those requirements (or they don't agree to provide company-related documents), you have to use the banked money method.