GOD'S WORD® Translation
So what is my reward? It is to spread the Good News free of charge. In that way I won't use the rights that belong to those who spread the Good News.

American Standard Version
What then is my reward? That, when I preach the gospel, I may make the gospel without charge, so as not to use to the full my right in the gospel.

Berean Study Bible
What then is my reward? That in preaching the gospel I may offer it free of charge, and so not use up my rights in preaching it.

Douay-Rheims Bible
What is my reward then? That preaching the gospel, I may deliver the gospel without charge, that I abuse not my power in the gospel.

English Revised Version
What then is my reward? That, when I preach the gospel, I may make the gospel without charge, so as not to use to the full my right in the gospel.

King James Bible
What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel.

World English Bible
What then is my reward? That, when I preach the Good News, I may present the Good News of Christ without charge, so as not to abuse my authority in the Good News.

Young's Literal Translation
What, then, is my reward? -- that proclaiming good news, without charge I shall make the good news of the Christ, not to abuse my authority in the good news;

1 Corinthians 9:18 Additional Translations ...