Careful, in France lying about your income can get you in jail for rape!

I would be more worried about (zzzz) (zzzz) in her eyes when you tell her you're an engineer. What kind of woman are you dating that an engineer's salary seems like winning the lottery? Otherwise agree with comments not to give a number. She's not your accountant.

"How much do you make?"

"A comfortable amount"

"What do you do?"

"It's a boring subject."

I've fucked women that had NO IDEA what I did (or if I was even employed). If she asks more than that, just change the subject nonchalantly. If she presses hard, treat her like a gold digger and look at her funny. If she really gets nasty with it, walk away.

Don't disguise it. Just don't give a number, do ride around in a nice car, and do keep a good looking house. Your love will NEVER be the pure nonshallow thing you're making it out to be. It might not be Jersey Shore but you'll still be shooting yourself in the foot by lowering your SMV. Like stickfiguresk said, be vague. Don't take deliberate measures that impede your quality of life though.

MBA, financial analyst here. Get the same response when I used to tell women what I did.

I've been using "I work at the zoo. I feed the penguins and teach them tricks."... at least initially.

Eventually, if you are going out with someone multiple times, it will come up again. I usually do let them know what I do, but NEVER give a number. Hell, I didn't even give my LTR of 3 years a number.

Approach it from a mid level drug dealers point of view. You can't say anything about what you actually do for a living, but you can subtly show that you command wealth and some degree of power. Think of things like driving a nice car, being well dressed, or having a nice apartment or house. Don't throw money directly at her with shit like bottle service, but do have tangential signs around. Let her imagination do the work for you while you dodge questions about what you actually do.

Find a way to describe what you do that is not a lie, but makes you sound like a super-hero.

"What do you do for a living?" "I find people, then make them pay for what they did..." (I'm a debt collector.)

"I work at an ostrich farm."

Do women actually ask how much you make? That would be a red flag for me...
They do ask when you do, and I actually like to talk about my job, so I don't mind.
If you don't want to say that you're an engineer (£££) then just say "I work for this or that company"

Simply don't tell her how much you make.

I figure that no girl can be turned on in a LTR with a guy who makes less than she does, because then she feels like she's his mom which is obviously a turnoff for her

You'd be wrong. There are a lot of Dark Triads including some former friends of mine who's girlfriends practically pay for them to exist. Hell, when I was younger an ex of mine even paid for me to get a driving license because she was tired of driving me everywhere.

Tell her your an engineer, don't tell her how much you earn, guard your bank details and statements (Get them sent digitally as opposed to in the post) and you should be fine. Discussing how much you earn or how much you have in the bank shouldn't even be on the cards unless you've been with her a long time.