This fiscal year's financial results were in the black.
経費削減でようやく黒字に転換した。
We finally turned a profit by cutting costs.
black letter
Rare, domain-specific use referring to black lettering or text, as opposed to red or other colors. Not common in everyday conversation.
この書類では、重要な項目は黒字で印刷されている。
In this document, important items are printed in black letters.
This fiscal year's budget ended up in the black.
This company turns a profit every year.
The company's performance turned from a loss into a profit.
trade surplus
black-ink bankruptcy; insolvency despite accounting profits
return to profitability; turnaround into the black