Your paycheck pays for everything else in this plan. This step makes sure an injury or illness can't quietly shut it off.
A 30-year-old earning $100K has well over $3.5 million in future paychecks ahead. You insure your car and your phone; your income dwarfs both. Without coverage, a serious disability drains the emergency fund, then retirement accounts, then turns into debt.
of today's 20-year-olds will become disabled before retirement (Social Security Administration). About 90% of long-term disabilities come from illness — not dramatic accidents.
Why 60%? An individual policy you pay for with after-tax dollars pays benefits tax-free, so ~60% of gross lands close to your normal take-home pay. Most people use employer group coverage as a base and add an individual policy to fill the gap.
Avoid "any-occupation" policies. They only pay if you can't work any job you're suited for — so an engineer who could still work a desk somewhere may get nothing. Typical cost for the right policy: 1–3% of income.