If I lose money selling stocks how long can I use it for deductions during tax season?

I lost a considerable sum of my investments a few years ago, I know that this can be used as a deduction during taxes…I just need to know how much time can pass before I can no longer use it as a deduction when tax season comes around.

Thank you

I bought a house(first time) Dec. of 07. Can I use this coming tax time to use the tax deductions?

I never did anything with the house on the previous tax season. I am an idiot with taxes and I dont know anything. Please talk to me like you’re telling a 4th grader how to make it to the restroom at church.

if i earn 1760 a month and my tax deductions are 272 a month. how much would i pay for the annual tax on april?

i wanted to save for tax season next year but i dont know how much to save. my deductions are really small and im afraid that i will be paying for a lot so im trying to save now. can someone please help? thank you.