As per the rules, every employer withholds money from your paycheck for your income tax. These taxes are only paid once a year.
What do employers do with the money they've withheld from you in the meantime? Where do they deposit it?
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In the US, amounts withheld from income for taxes must be passed to the IRS on either a monthly or semi-weekly basis.
While I suppose this may vary from country to country, everywhere I know of that employers withhold tax, they send it regularly to the government. For example here in Canada, I pay my staff twice a month. Once a month I must send these "withholdings" - tax, employment insurance, government pension - to the government. (I can "kite" a little by paying someone their net pay on the 15th and not having to send the withholding to the government for a few more weeks, but that's all.)
I have other "withholdings" that are not tax, such as paying premiums on private health insurance, and I use these to pay those bills each month. I'm sure it's the same for your employer. Also, here, if I withhold $1000 from you for the government and don't send it to them, that doesn't matter to you. Once I've told them (on your T4 tax slip that summarizes your income) that I withheld it for you, you get credit for it even if I fail to ever send it in.
As a result, you don't really need o know what your employer does with it.
In the U.S. -- they don't "deposit" it. They make payments to the IRS, either through their bank (all business banks have this facility) or by having the IRS debit their accounts. Some do this after each payroll period, and it's a very large amount of money if the company's big. A similar approach applies for the state taxes. Both IRS and the states really avoid the occurrence of employers making a lump-sum payment at the end of the year, because the employer's less likely to have the money after sitting on it for so long.