How Do You Deal With Your Company Taxes?

So imagine you start the company with $1M for easy math.The product that you sell requires 3 years to be created. It's not a problem because you have money already.You think about spending $300k per year.But...you have to pay taxes every single year.So how do you adapt to that?If you pay $300k the first year you have $700k left meaning you will be taxed on that and spend way too much money so it's not worth it.You think about writing off everything as a business expense and decide to spend most of your money to avoid taxes but if you do that you don't have enough money for the next two years.So how do companies deal with this? How do you do it yourself?Not everyone lives in the US so taxes aren't the same but the idea/concept is what I am interested in.I have so many questions related to taxes and I am thinking about talking to an accountant but before that, I really want to know the opinion of people who actually run businesses.Thanks,Nour see hubwealthy.com/wealthy