Inflation calculation?

To maintain $20k a month for 60 years, you need to have an income of $20k now.

I think you mean how much do I have to earn in each year over the next 60 years to maintain the same level of income in real terms.

Year Income Inflation rate

0 $20,000.00

1 $20,700.00 1.035

2 $21,424.50 1.035

3 $22,174.36 1.035

4 $22,950.46 1.035

5 $23,753.73 1.035

6 $24,585.11 1.035

7 $25,445.59 1.035

8 $26,336.18 1.035

9 $27,257.95 1.035

10 $28,211.98 1.035

11 $29,199.39 1.035

12 $30,221.37 1.035

13 $31,279.12 1.035

14 $32,373.89 1.035

15 $33,506.98 1.035

16 $34,679.72 1.035

17 $35,893.51 1.035

18 $37,149.78 1.035

19 $38,450.03 1.035

20 $39,795.78 1.035

21 $40,910.06 1.028

22 $42,055.54 1.028

23 $43,233.10 1.028

24 $44,443.62 1.028

25 $45,688.04 1.028

26 $46,967.31 1.028

27 $48,282.39 1.028

28 $49,634.30 1.028

29 $51,024.06 1.028

30 $52,452.73 1.028

31 $53,921.41 1.028

32 $55,431.21 1.028

33 $56,983.29 1.028

34 $58,578.82 1.028

35 $60,219.02 1.028

36 $61,905.16 1.028

37 $63,638.50 1.028

38 $65,420.38 1.028

39 $67,252.15 1.028

40 $69,135.21 1.028

41 $75,357.38 1.09

42 $82,139.54 1.09

43 $89,532.10 1.09

44 $97,589.99 1.09

45 $106,373.09 1.09

46 $115,946.67 1.09

47 $126,381.87 1.09

48 $137,756.24 1.09

49 $150,154.30 1.09

50 $163,668.18 1.09

51 $178,398.32 1.09

52 $194,454.17 1.09

53 $211,955.04 1.09

54 $231,031.00 1.09

55 $251,823.79 1.09

56 $274,487.93 1.09

57 $299,191.84 1.09

58 $326,119.11 1.09

59 $355,469.83 1.09

60 $387,462.11 1.09

So in 60 years you would need to earn $387,462.11 per month to earn the same amount in real terms.