diff --git a/basic_client.go b/basic_client.go
index c79c2c0..7cf008b 100644
--- a/basic_client.go
+++ b/basic_client.go
@@ -23,6 +23,8 @@ type BasicClient struct {
 	CarriageReturn bool
 	// Set User-Agent header to this string, if not empty
 	UserAgent string
+
+	HTTPClient *http.Client
 }
 
 // OfxVersion returns the OFX specification version this BasicClient will marshal
@@ -70,6 +72,11 @@ func (c *BasicClient) RawRequest(URL string, r io.Reader) (*http.Response, error
 		return nil, errors.New("Refusing to send OFX request with possible plain-text password over non-https protocol")
 	}
 
+	httpClient := c.HTTPClient
+	if httpClient == nil {
+		httpClient = http.DefaultClient
+	}
+
 	request, err := http.NewRequest("POST", URL, r)
 	if err != nil {
 		return nil, err
@@ -79,7 +86,7 @@ func (c *BasicClient) RawRequest(URL string, r io.Reader) (*http.Response, error
 	if c.UserAgent != "" {
 		request.Header.Set("User-Agent", c.UserAgent)
 	}
-	response, err := http.DefaultClient.Do(request)
+	response, err := httpClient.Do(request)
 	if err != nil {
 		return nil, err
 	}
diff --git a/basic_client_test.go b/basic_client_test.go
new file mode 100644
index 0000000..01a6146
--- /dev/null
+++ b/basic_client_test.go
@@ -0,0 +1,31 @@
+package ofxgo
+
+import (
+	"errors"
+	"net"
+	"net/http"
+	"strings"
+	"testing"
+)
+
+func TestBasicClient_HTTPClient(t *testing.T) {
+	c := &BasicClient{
+		HTTPClient: &http.Client{
+			Transport: &http.Transport{
+				Dial: func(network, addr string) (net.Conn, error) {
+					return nil, errors.New("bad test client")
+				},
+			},
+		},
+	}
+	_, err := c.Request(&Request{
+		URL: "https://test",
+		Signon: SignonRequest{
+			UserID:   "test",
+			UserPass: "test",
+		},
+	})
+	if err == nil || !strings.Contains(err.Error(), "bad test client") {
+		t.Fatalf("expected error containing 'bad test client', got: %v", err)
+	}
+}