Answer:
Tom should review and revise his plan on a regular basis, e.g. once a year or once every 6 months. A financial plan is a budget, and like all budgets, it represents an estimate or forecast of future events. If any person was able to predict the future and be 100% right every time, they would play the lottery and earn millions every week. The future is always uncertain, and just like a company must review and revise their forecasts, so should Tom. This advice applies to all of us that try to stick to some type of financial plan.