@Laura33 covered a lot of what I was thinking/feeling, so I'll try to be brief. But I don't think you are dealing with YOUR role in this outcome.
- 95% of your furniture is used.
- She's driving a car with 200k miles on it.
- She is supposed to buy everything from the allowance, including household items and things for the kid.
- You micromanage a purchase of $300 or more.
I don't think you have ANY IDEA how expensive it is to be a woman in America today, with even a FRACTION of a desire to dress well, and to have stylish clothes or hair or home.
Guys have it easy: Docker khakis, a button-down shirt, and loafers. If you have to wear a suit occasionally, you can get by with the one you bought a decade ago for a funeral.
Women: hemlines change; color palettes change; for pants: pleated vs. non-pleated vs. cuffed vs. wide leg vs. narrowed at the ankle.
Cosmetics can be inexpensive, but most women I know use some. They expire and go bad. I have one of the most low-frill beauty and cosmetics routine I know, and I spend ~ $25 per month on personal products such as facial wash, scrub, razor blades, soap, shampoo, conditioner, detangler, root volumizer. Personal care items like tampons/pads/liners? $15 per month. For cosmetics, probably $200 per year. A single lipstick or eyeliner can be $20. The more expensive stuff holds its color better, doesn't clump when applied, and glides on more smoothly.
Hair: I spend $225 on a haircut, color and highlight every two months. Hair clips and bands break and get lost, so I replenish these at Xmas as stocking stuffers.
You have a daughter? Double this, if she's older than 12.
Shoes: I have a basic pair of black shoes I wear for work. $200 a pair, every two years.
I think you're an idiot by setting up the system that comforts YOU and suits YOU. Clearly it doesn't suit your wife. And claiming that he spending is "genetic?" Ludicrous. You are holding yourself out as some sort of budgeting and frugalistic messiah, put on this earth to mend her ways.
How does your wife spend time with her friends? I assume she has some, and if they want to do a spa day that she hadn't anticipated, you're expecting her to ASK YOU FOR PERMISSION to spend some of her own earned money.
How about you reverse it? Have a no budget budget?My pay goes into MY checking account. DH puts his in HIS account. We have individual savings accounts, and a household savings account as well.
We both transfer a household amount monthly into the account that we use for household expenses.
I have MY credit card. DH has his. And we have one that is JOINT. The joint is paid every month from the joint account. If we have charged more than expected, we each transfer more to the joint checking account that month.
If DH spends $500 in aviation fuel for the month, he uses his card. If I have a spa day with my mom and sister, it goes on my card. We pay for own clothing as well.
My initial request when we set this up 20+ years ago, was that DH needed to fully fund his IRA every year, no arguments. So he would include $200 extra each month into the "household checking" for his Fidelity IRA. Once he bought his own company, the agreement morphed into "you need to fully fund your SEP-IRA every year." So when our accountant told us in February what DH could send to the SEP, he had two months before the April 15th deadline to get it done. So he does.
All of this to say: she's a grownup. She brings in a significant amount of the household income, and you're treating her as if she's a recalcitrant teenager, and only your financial priorities should be met. WHO CARES if she's spending an extra $200 per month? HOW DO YOU KNOW that you haven't just mis-estimated ACTUAL costs? Have you built in any inflationary factor, ever? Things cost more than they did 5 years ago - does your plan account for that?
I would ASK HER to do her preferred budget going forward. No lies, no evasions, no required justifications. If she wants a spa day 2x per year, BUDGET IT. It could be unbelievably revealing what she's spent the CCd dollars on. I'll be you're gonna hate every one of them, which is why you've forced her into hiding it.
Do better. Be better. Divorce will suck, it will be SO MUCH MORE expensive with two households, and your FIRE date will be absolutely imploded. Take the high road - it's also going to be the cheaper one, in the long run.
Best of luck.