How should I update my plan(s) as things change over time?

What some people do is keep two plans:

• One “original” plan that projects from a fixed date and is rarely (if ever) modified. This is to keep track of what the first-ever version of your plan was, and then see progress overlaid on top as time goes by.
• A second plan which is actively updated and projects from now, always inheriting the latest data from the Current Finances section as the starting conditions.

The idea is you’d keep Plan #2 up-to-date with your latest income, expenses, etc. so you can always use it to see projections from the current point in time into the future. Generally, you’d be working with Plan #2 much more often… but you’d still have Plan #1 lying around whenever you want to see how your actual progress compares to the original forecast.