Will Macao's overdue travel affect Singapore?

I'll break down your influence into two parts: the influence of leaving Macao and the influence of entering Singapore:

Most people who leave Macao can pay a fine, but they may be sent back to the mainland;

Entering Singapore has nothing to do with 1. It is only related to your passport and visa.

Supplement: You can understand it as the custom of a neutral country.

A fine for overstaying

One,

According to administrative regulation 14/20 14-"amending the regulations on entry, stay and residence permit", starting from July 9, 20 14, those who stay in the Macao special administrative region for less than 30 days after the expiration of the permit period will be fined MOP 500 yuan for each overdue day. The above fine does not apply to those who overstay in Macao within 1 year. Those who fail to pay or apply for a fine are regarded as illegal immigrants, and the Immigration Bureau will not accept their applications for residence permits, extended residence permits or residence permits for foreign workers within two years.

Second,

Those who are considered illegal immigrants according to Law 6/2004 will be deported and prohibited from entering the Macao Special Administrative Region for the period specified in the expulsion order.