The word "uncollected" means something that has not been gathered or gathered together, or something that has not been paid or collected. Full definition
The British newspaper, The Financial Times, for example, found that four of the largest U.S. banks, Citi, J.P. Morgan Chase, Bank of America and Wells Fargo, lost roughly $ 12.5 billion in uncollected debt in 2017 — almost 20 percent more than they wrote off the year before. (creditcards.com)
Even after you retire, your employer will continue to send you a W - 2 for the imputed income and showing the amount of uncollected Social Security and Medicare taxes you owe. (answers.com)
In some cases beneficiaries are unaware they are named on a policy, and proceeds go uncollected for years because some insurers are not diligent about tracking down survivors of policyholders. (insurance.com)