Here is how to indent:
Code:
#include<iostream>
#include<string>
using namespace std;

int main(){


    float rate,hours,overtime,overtimerate,undues,overtimehours;
    float dependents,dependnum,netpay,grosspay,sstaxt,fitaxt,sitaxt;        //declares variables
    string dependanswer;


    overtimehours=hours-40;
    overtimerate=16.78/2;
    rate=16.78;
    grosspay=rate*hours;
    overtime=overtimehours*overtimerate;
    sstaxt=grosspay*.06;
    fitaxt=grosspay*.14;
    sitaxt=grosspay*.05;
    undues=10;
    dependents=35;


    cout<<"How many hours were worked? \n";        //asks how many hours worked
    cin>>hours;

    cout<<"Do you have any dependents? <Y or N>? \n"; //do yo have dependents
    cin>>dependanswer;    

    if(hours>=41 && dependanswer=="y" || dependanswer=="Y" ){        //if you worked overtime and have dependents

        cout<<"How many dependents do you have? \n";
        cin>>dependnum;

        if(dependnum>=3){                //if you have 3 or more dependents        

            overtimehours=hours-40;
            overtimerate=16.78/2;
            rate=16.78;
            overtime=overtimehours*overtimerate;
            sstaxt=grosspay*.06;
            fitaxt=grosspay*.14;
            sitaxt=grosspay*.05;
            undues=10;
            dependents=35;
            grosspay=hours*rate+overtime;
            netpay=grosspay-sstaxt-fitaxt-sitaxt-undues-dependents;

            cout<<"Gross Pay: $"<<grosspay<<" \n";                    //outputs what i want
            cout<<"Overtime hours: "<<overtimehours<<" \n";
            cout<<"Social Security: $"<<sstaxt<<" \n";
            cout<<"Federal Income: $"<<fitaxt<<" \n";
            cout<<"State Income: $"<<sstaxt<<" \n";
            cout<<"Union Dues: $10 \n";
            cout<<"Health Insurance: $"<<dependents<<" \n";
            cout<<"Net Pay: $"<<netpay<<" \n";
        }

        if(dependnum<=2){        //if you have less than 3 dependents

            overtimehours=hours-40;
            overtimerate=16.78/2;
            rate=16.78;
            overtime=overtimehours*overtimerate;
            sstaxt=grosspay*.06;
            fitaxt=grosspay*.14;
            sitaxt=grosspay*.05;
            undues=10;
            grosspay=hours*rate+overtime;
            netpay=grosspay-sstaxt-fitaxt-sitaxt-undues;


            cout<<"Gross Pay: $"<<grosspay<<" \n";
            cout<<"Overtime hours: "<<overtimehours<<" \n";
            cout<<"Social Security: $"<<sstaxt<<" \n";
            cout<<"Federal Income: $"<<fitaxt<<" \n";
            cout<<"State Income: $"<<sstaxt<<" \n";
            cout<<"Union Dues: $10 \n";
            cout<<"Health Insurance: $0 \n";
            cout<<"Net Pay: $"<<netpay<<" \n";
        }

    }


    if(hours>=41 && dependanswer=="n" ||dependanswer=="N"){        //if overtime & you dont have dependents

        overtimehours=hours-40;
        overtimerate=16.78/2;
        rate=16.78;
        overtime=overtimehours*overtimerate;
        sstaxt=grosspay*.06;
        fitaxt=grosspay*.14;
        sitaxt=grosspay*.05;
        undues=10;
        grosspay=hours*rate+overtime;
        netpay=grosspay-sstaxt-fitaxt-sitaxt-undues;

        cout<<"Gross Pay: $"<<grosspay<<" \n";
        cout<<"Overtime hours: "<<overtimehours<<" \n";
        cout<<"Social Security: $"<<sstaxt<<" \n";
        cout<<"Federal Income: $"<<fitaxt<<" \n";
        cout<<"State Income: $"<<sstaxt<<" \n";
        cout<<"Union Dues: $10 \n";
        cout<<"Health Insurance: $0 \n";
        cout<<"Net Pay: $"<<netpay<<" \n";

    }

    if(hours<=40 && dependanswer=="y" || dependanswer=="Y"){        //if no overtime and dependents

        cout<<"How many dependents do you have? \n";
        cin>>dependnum;

        if(dependnum>=3){        //if you have 3 or more dependents

            rate=16.78;
            grosspay=rate*hours;
            sstaxt=grosspay*.06;
            fitaxt=grosspay*.14;
            sitaxt=grosspay*.05;
            undues=10;
            dependents=35;
            netpay=grosspay-sstaxt-fitaxt-sitaxt-undues-dependents;

            cout<<"Gross Pay: $"<<grosspay<<" \n";
            cout<<"Overtime hours: 0 \n";
            cout<<"Social Security: $"<<sstaxt<<" \n";
            cout<<"Federal Income: $"<<fitaxt<<" \n";
            cout<<"State Income: $"<<sstaxt<<" \n";
            cout<<"Union Dues: $10 \n";
            cout<<"Health Insurance: $"<<dependents<<" \n";
            cout<<"Net Pay: $"<<netpay<<" \n";
        }

        if(dependnum<=2){        //if you have less than 3 dependents


            rate=16.78;
            grosspay=rate*hours;
            sstaxt=grosspay*.06;
            fitaxt=grosspay*.14;
            sitaxt=grosspay*.05;
            undues=10;
            netpay=grosspay-sstaxt-fitaxt-sitaxt-undues;

            cout<<"Gross Pay: $"<<grosspay<<" \n";
            cout<<"Overtime hours: 0 \n";
            cout<<"Social Security: $"<<sstaxt<<" \n";
            cout<<"Federal Income: $"<<fitaxt<<" \n";
            cout<<"State Income: $"<<sstaxt<<" \n";
            cout<<"Union Dues: $10 \n";
            cout<<"Health Insurance: $0 \n";
            cout<<"Net Pay: $"<<netpay<<" \n";
        }
    }

    if(hours<=40 &&dependanswer=="n"||dependanswer=="N"){        //if no overtime and no dependents

        rate=16.78;
        grosspay=rate*hours;
        sstaxt=grosspay*.06;
        fitaxt=grosspay*.14;
        sitaxt=grosspay*.05;
        undues=10;
        netpay=grosspay-sstaxt-fitaxt-sitaxt-undues;

        cout<<"Gross Pay: $"<<grosspay<<" \n";
        cout<<"Overtime hours: 0 \n";
        cout<<"Social Security: $"<<sstaxt<<" \n";
        cout<<"Federal Income: $"<<fitaxt<<" \n";
        cout<<"State Income: $"<<sstaxt<<" \n";
        cout<<"Union Dues: $10 \n";
        cout<<"Health Insurance: $0 \n";
        cout<<"Net Pay: $"<<netpay<<" \n";

    }



    system("pause");
    return 0;
}