It depends on the type of relationship that you have. And what is right for one couple is not right for all couples.
If it's a short-term or new relationship, you shouldn't be expected to tell the other person how much you earn. This is a personal detail that you should feel comfortable keeping to yourself. This is especially true if you are successful as you likely don't want someone who is with you just because you earn a lot. Most people don't enjoy being used like that.
If you've been in a relationship with a person for a while, oftentimes that's something that will come up. If you're talking about marriage or a committed relationship, you may want to know what the other person earns so you can make informed decisions together.
In some marriages, the finances are kept separate. Each person has specific things for which they're responsible, and no information is shared beyond that. This works for some couples as it gives them a little more control over their finances, and if something goes wrong, there aren't big messes to untangle. Additionally, it means they're less likely to be used for their money because the other person has clearly noted financial responsibilities.
However, this does have its own set of issues. One of the issues is a potential for perceived lack of commitment. By not combining or sharing finances, it could lead one partner to assume (even sub-contentiously) that the other person is not as committed and is looking for a way out of the relationship. As with most relationships, good communication will help alleviate potential issues.
In many relationships, the finances are shared. When this is the case, both individuals share their finances with each other and determine the use of the finances as a couple. Salaries, benefits, and bonuses are disclosed and often combined into one bank account. Either party is able to use the money for what they need. Each couple decides how they want to allocate that money, so it's not always the same, but generally speaking "what's mine is yours and what's yours is mine."
The couple still has to decide who pays which bills and how much money an individual can spend without consulting the other. The starting point is that the money is combined and is used for the benefit of the couple, not just the individual who earned the money.
Whatever you decide to do, you shouldn't feel pressured into disclosing your salary until you're ready. And whether or not you decide to combine finances with someone should be a decision that you make together with both parties agreeing.
tl;dr Some people share how much they earn, others don't. That's up to you. If you don't want to disclose it, you should probably communicate that so your partner doesn't think you're just avoiding the conversation.
Note: Do your own research. Don't assume everyone is trustworthy. Make sure that you don't take risks that you're not comfortable taking. Your choices are your own.
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By partner you don't obviously mean people you date but someone you share your life with. I'm assuming you wouldn't call someone you regularly see but don't share a household with your partner. If you live with someone, you can't keep knowledge of your income from them if you earn a lot less than them because you'd be having constant trouble being able to afford the standard of living you share. If you earn a lot more than them, you can of course volunteer to live clearly below your means. It's up to anyone to decide which is healthy for them. But not having the same standard of living with your partner would be very strange. Imagine eating different food than them, going on holidays separately and regularly buying better furniture than them for your personal use only, enjoying better healthcare etc than them. It wouldn't make any sense.
Why not? Trust and common regard are fundamentals in a conjugal relationship. Yet, let it be a deliberate demonstration from spouse side and on the off chance that he doesn't tell, no compelling reason to make an issue out of it.
Today, the majority of wedded ladies are working and keep up money related independency and are not unduly made a big deal about their better half's compensation. It is additionally wrong to expect every single wedded lady are against in-laws and aversion spouse offering cash to them. There are many adoring girl in-laws who deal with spouse's folks.
So there is not much and quick and let people pick what suits them best.