A really simple basic tax calculator UK (C++)

Ok, first of all, there is a disclaimer with this: Whilst it is a tax calculator, it is really basic and should only be used as an estimate. This calculator will not calculate profit and losses; it is just a case of entering the amount for the year, and it will work out either 20%, 40%, or 45% tax overall. If you want the code, though, it’s below. I will be expanding on this over the next few weeks and hope to release it with a full UI and add more features.

#include <iostream>

#define taxBand1 20.00
#define taxBand2 40.00
#define taxBand3 45.00

int main() {
    int userInput;
    std::cout << "Enter an input" << std::endl;
    std::cin >> userInput;
    
    if (userInput > 12570 && userInput < 50270) {
        std::cout << "Tax Band 1" << std::endl;
        float afterTax = userInput / 100.0 * taxBand1;
        std::cout << "The tax you pay on that amount is: £" << afterTax << std::endl;
    } 
    else if (userInput > 50270 && userInput < 150000) {
        std::cout << "Tax Band 2" << std::endl;
        float afterTax = userInput / 100.0 * taxBand2;
        std::cout << "The tax you pay on that amount is: £" << afterTax << std::endl;
    } 
    else if (userInput > 150000) {
        std::cout << "Tax Band 3" << std::endl;
        float afterTax = userInput / 100.0 * taxBand3;
        std::cout << "The tax you pay on that amount is: £" << afterTax << std::endl;
    } 
    else {
        std::cout << "You did not earn enough to get taxed... Lucky you!";
    } 
}